The following statement best describes the given reaction: 4 Al(s) + 3 O_2(s) rightarrow 2 Al_2O_3(s) as a combination reaction.
A combination reaction is a chemical reaction in which two or more substances combine to form a new compound. In this type of reaction, the reactants combine to create a more complex product. The most frequent form of a combination reaction is the one between a metal and a nonmetal to create an ionic compound.
The given reaction, 4 Al(s) + 3 O_2(s) rightarrow 2 Al_2O_3(s) is a combination reaction because the reactants (Al and O2) combine to form a more complex product (Al2O3).Hence, the correct answer is the combination reaction.
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whats another name for body cells (not sex cells) that are produced by mitosis?
Answer: Diploid Cells (?)
Explanation:
issued this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your etext. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon.
The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.
Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.
Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.
According to the given data;
Decomposition of carbon monoxide (CO);
Oxygen produced = 3.36 g
Carbon produced = 2.52 g
We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;
Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol
Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol
Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;
0.21 mol C / (0.21 mol O) = x
Simplifying the equation, we have;
x = 1
Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.
Decomposition of carbon dioxide (CO₂);
Oxygen produced = 9.92 g
Carbon produced = 3.72 g
Following the same calculations as before;
Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol
Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol
Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;
0.31 mol C / (0.62 mol O) = y
Simplifying the equation, we have;
y = 0.5
Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.
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--The given question is incomplete, the complete question is
"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--
Atomic mass unit is calculated with reference to
Answer:Carbon
Explanation:
please please help me solve this, I have a test and only 20 mins left T-T
Answer: \(5.6dm^3[/tex[ of gas is produced when 0.1 moles of magnesium nitrate is decomposed.
Explanation:
The balanced chemical equation is:
\(2NH_4NO_3(s)\rightarrow 2MgO(s)+4NO_2(g)+O_2(g)\)
According to stoichiometry :
2 moles of \(NH_4NO_3\) produce = 4 moles of \(NO_2\) gas and 1 mole of \(O_2\) gas
2 moles of \(NH_4NO_3\) produce = 5 moles of gas
Thus 0.1 mole of \(NH_4NO_3\) produce =\(\frac{5}{2}\times 0.1=0.25moles\) of gas
Volume of gas produced = \(moles\times {\text {Molar volume}}=0.25moles\times 22.4dm^3/mol=5.6dm^3\)
Thus \(5.6dm^3[/tex[ of gas is produced when 0.1 moles of magnesium nitrate is decomposed.
Draw the product of the aldol-dehydration reaction with diethylketone and p-tolualdehyde. (one
The aldol reaction involves the condensation of an enolizable aldehyde or ketone with an electrophile. In the presence of a base, the electrophile attacks the carbonyl carbon, forming an alkoxide intermediate.
The alkoxide ion then abstracts a proton from an alpha-carbon, forming an enolate ion. The enolate ion is a nucleophile and can attack an electrophile, resulting in a new carbon-carbon bond.
In the case of the aldol-dehydration reaction, the product of the aldol reaction is further dehydrated to form an α,β-unsaturated carbonyl compound. This is achieved by removing a molecule of water from the aldol product. The removal of water is often facilitated by heating the reaction mixture, which drives off the water as a gas.
In the specific case of the reaction of diethylketone and p-tolualdehyde, the aldol reaction leads to the formation of a β-hydroxy ketone intermediate. This intermediate then undergoes dehydration to give a product that contains an α,β-unsaturated ketone.
In conclusion, the aldol-dehydration reaction is a powerful tool for the formation of new carbon-carbon bonds. By carefully selecting the starting materials and reaction conditions, a wide variety of α,β-unsaturated carbonyl compounds can be synthesized.
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Of the following bonds, which is most polar?Group of answer choicesS-ClC-NC-BC-OP-S
Explanation:
The polarity of a bond is given by the difference in electronegativity between the two atoms that form said bond.
Long chain and very long chain FA require ____________ to enter the mitochondrial matrix for beta-oxidation
Long chain and very long chain fatty acids (FA) require carnitine shuttle system to enter the mitochondrial matrix for beta-oxidation.
This system consists of three primary components: carnitine palmitoyltransferase I (CPT I), carnitine-acylcarnitine translocase (CACT), and carnitine palmitoyltransferase II (CPT II). CPT I, located on the outer mitochondrial membrane, converts the long-chain FA into their respective acylcarnitines by attaching a carnitine molecule to them. These acylcarnitines can then be transported across the inner mitochondrial membrane by CACT, which is a transport protein. Once inside the matrix, CPT II, which is bound to the inner mitochondrial membrane, detaches the carnitine group and reattaches the original CoA group, generating a long-chain acyl-CoA that is ready for beta-oxidation.
Beta-oxidation is a process that breaks down fatty acids into smaller units called acetyl-CoA, which can then enter the citric acid cycle (also known as the Krebs cycle or TCA cycle) to generate ATP, the energy currency of cells. This process is vital for energy production, especially during times of fasting or prolonged exercise when glucose stores are depleted. Overall, the carnitine shuttle system is essential for the efficient transport and utilization of long chain and very long chain fatty acids for energy production through beta-oxidation.
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Does light take up space?
Answer:
no
Explanation:
light is a form of energy so it doent have matter therefore it doent take up sapce
2-2. (10 points) At the bottom of a flat, quiescent (i.e., no advection) lake there are solid deposits of manganese. Due to a change in redox conditions manganese is dissolving into the water and just above the manganese deposits the concentration is 60μg/L. The lake serves as a water source for the water treatment plant that does not currently have manganese treatment. The water system's goal is for manganese to remain below its detection limit of 2μg/L because manganese accumulation in the distribution system can lead to black water events. a) What is the dominate transport mechanism in the lake? b) The intake at the water treatment plant is 1ft from the lake bottom. How long does the water treatment plant have before it needs to start treating for manganese? Use equation 1−18 in Benjamin and Lawler that is provided for stagnant conditions. The diffusion coefficient for manganese is 6.88×10−6 cm2/s. c) As a temporary solution the water treatment plant plans to raise the water intake level so that it has 1 year to design and install a manganese treatment system. What minimum height above the lake bottom should the intake be raised?
The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.
Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.
Initial concentration: The concentration of manganese just above the deposits is given as 60 μg/L.Detection limit: The water treatment plant aims to keep the manganese concentration below the detection limit of 2 μg/L to prevent black water events.Time to start treating: To determine how long the water treatment plant has before it needs to start treating for manganese, we can use Equation 1-18 in Benjamin and Lawler, which is provided for stagnant conditions. The equation is:t = (L^2) / (4D)
where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).
Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.
t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds
Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days
Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.
Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.
t = (L^2) / (4D)
Rearranging the equation to solve for L:
L = √(4Dt)
Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))
L ≈ 49.65 cm or 0.163 ft
The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.
The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.
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2. Points that do not lie on the same line.
O Ray
O
Line segment
O Point
Non-collinear
Points that do not lie on the same line are non-collinear or noncollinear.
Ascorbic acid has a molar mass of 176. 14 g/mol. What is the molecular formula of ascorbic acid?
The molecular formula of Ascorbic acid is C6H8O6 having the molar mass of 176.14 g/ mole.
Ascorbic acid is known as the chemical name for Vitamin C. Ascorbic acid is commonly found in high concentrations in citrus fruit. This acid is also found in tomatoes, broccoli, and many other fruits and vegetables. Vitamin C is a nutrient of the body needs to form blood vessels, cartilage, muscle and collagen in bones. This vitamin is also vital to the body's healing process.
A molecular formula is defined as a chemical formula of a molecular compound that shows the kinds and numbers of atoms present in a molecule of the compound. This is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule using chemical element symbols and numbers.
A molecule of the ascorbic acid will have a mass of 176.124 atomic mass units.
This is determined by adding 6 X 12.011 for carbon + 8 X 1.008 for hydrogen + 6 X 15.999 for oxygen.
This is equals to the 72.066 for carbon + 8.064 for hydrogen + 95.994 for oxygen. Added together, these equal 176.124 molecular mass.
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In 2007, the population of Canada was 1.26 × 108, the population of Mexico was 10.6 × 107, the population of Brazil was 13.6 × 107, and the population of China was 1.86 × 109. Which two countries have the highest population?
A. Canada and China
B. Mexico and China
C. China and Brazil
D. Brazil and Mexico
How many grams of water are produced when oxygen reacts with an excessive amount of propane (C3H8)?
Answer:
From the equation you will see that 1 mol of propane generates 4 mols of water.
Since the molar mass of water
M ( H2O)=2×1+16=18g/mol
2 mol propane will generate
2 ×4×18=144g of water
Explanation:
Since the molar mass of water
M ( H2O)=2×1+16=18g/mol
2 mol propane will generate
2 ×4×18=144g of water
When an ionic compound is added to water, the will be attracted to the partially positive h atom of water and the will be attracted to the partially negative o atom of water. As the compound dissolves the ions separate from each other, or.
Answer:
Ionic compounds dissolve in water because the water molecules hydrate the ions.
Explanation:
To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond.
They do this by hydrating the ions.
Water is a polar molecule. It has a permanent dipole.
The
O
atom has a partial negative charge, and the
H
atoms have a partial positive charge.
When an ionic compound is added to water, the anion is attracted to partially positive hydrogen atom of water and cation is attracted to partially negative oxygen atom of water.
What is an ionic compound?Ionic compound or electrovalent compound is a type of compound which is formed between the two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.
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Hell me ASAP please
Which of the following is true about the coefficients in a balanced chemical equation?
Answer:
Where is the chemical equations?
A balanced equation obeys the law of conservation of mass. The coefficient represent the number of molecules in a chemical equation.
What is a balanced chemical equation?An equation in which the number of reactants and products on the both sides of the reaction are equal can be defined as the balanced chemical equation. The coefficient are the numbers in front of the formula.
The coefficients are the numbers that must be added in front of the species involved in the reaction in order to balance it. It tells how many number of atoms or molecules are present in a reaction.
In the reaction N₂ + 3H₂ → 2NH₃ which is called Haber's process.
The coefficients are:
1 for Nitrogen molecule, 3 for Hydrogen molecule and 2 for the compound Ammonia.
Thus coefficients are numbers in front of each formula.
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What is the name of the smallest unit of matter that retains the properties of an element?
An atom is the smallest unit of matter retaining the properties of elements.
What is an atom?
A particle of matter uniquely defining a chemical element is called an atom.
Atoms consist of central nucleus surrounded by one or more electrons that are negatively charged. The nucleus itself is positively charged, containing one or more heavy particles called neutrons and protons.
Hydrogen and neon are good examples of atoms.
Atoms have an electric charge of zero, i.e. neutral.
They are indivisible particles, capable of being neither created nor destroyed in chemical reactions.
Therefore, the smallest unit of matter that can retain properties of elements is called an atom.
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Calculate the ratio of H* ions to OH-ions at a pH = 7.
Find the concentration of H* ions to OH ions listed in
Table B of your Student Guide. Then divide the H*
concentration by the OH concentration. Record this
calculated ratio in Table A of your Student Guide.
Compare your approximated and calculated ratios of H+
ons to OH-ions at a pH = 7. Are they the same? Why or
why not? Record your comparison in Table A.
What is the concentration of H+ ions at a pH = 7?
mol/L
What is the concentration of OH-ions at a pH = 7?
mol/L
What is the ratio of H+ ions to OH-ions at a pH = 7?
:
Please help!! Worth 100 points!!
a) The concentration of the hydrogen ions is 1 * 10^-7 M
b) The concentration of the hydroxide ions is 1 * 10^-7 M
c) Ratio of the hydrogen to the hydroxide ion is 1:1
What is the pH?We know that the pH of the solution would have to do with ratio of the hydrogen ion and the hydroxide ions that we have in the solution. We know that the pH values that range from 0 -6 is acid, 7 is neutral and 8 - 14 is basic.
Then we have that;
Concentration of the hydrogen ion in the solution is obtain from the formula;
[H^+] = Antilog (-pH)
At pH 7 we have;
[H^+] = Antilog (-7)
= 1 * 10^-7 M
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please help me I need to know these answers rn A, B, OR C to each one
Answer:
First one
Explanation:
Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them
Answer:
Question 2:
Cohesion and adhesion
Water has forces of attraction between different molecules, so its molecules are locomotive.
Question 3:
Surface tension
It experiences a perpendicular force which keeps the area of the pepper on surface
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What term is used to define when a substance reacts quickly with oxygen to produce light and heat?
A. rusting
B. sublimation
C. precipitation
D. burning
Answer:
I think it's a
Explanation:
not sure hssjkskaakakskksskksqoqkakskzksjsj
Answer: The answer is, D) Burning.
Explanation: Some moderator removed my last answer because someone reported it.
TEST QUESTION PLS HELP What are isotopes? Write isotopes of three different elements, showing their atomic number and mass number. (I'll give brainliest)
Answer:
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table
Explanation:
Hope this helps some? :)
a reaction vessel contains 5.77 g of white phosphorus and 5.77 g of oxygen. the first reaction to take place is the formation of phosphorus(iii) oxide, . if enough oxygen is present, the oxygen can react further with this oxide to produce phosphorus(v) oxide, . (a) what is the limiting reactant for the formation of ? (b) what mass of is produced? (c) how many grams of the excess reactant remain in the reaction vessel?
The number of moles of O2 remaining after the first reaction is:
n(O2) excess = n(O2) initial - n(O2) reacted = 0.1803 mol - 0.0349 mol = 0.1454
The balanced chemical equation for the first reaction, the formation of phosphorus(III) oxide, is:
4 P + 3 O2 → 2 P4O6
The balanced chemical equation for the second reaction, the formation of phosphorus(V) oxide, is:
P4O6 + 3 O2 → 2 P4O10
(a) To determine the limiting reactant, we need to calculate the amount of product that can be formed from each reactant, assuming that the other reactant is present in excess.
For white phosphorus (P4), the molar mass is 124 g/mol, and the number of moles present is:
n(P4) = m / M = 5.77 g / 124 g/mol = 0.0466 mol
From the balanced chemical equation, 4 moles of P4 react with 3 moles of O2 to produce 2 moles of P4O6. Therefore, the number of moles of P4O6 that can be formed is:
n(P4O6) = 0.0466 mol P4 × (2 mol P4O6 / 4 mol P4) = 0.0233 mol P4O6
For oxygen (O2), the molar mass is 32 g/mol, and the number of moles present is:
n(O2) = m / M = 5.77 g / 32 g/mol = 0.1803 mol
From the balanced chemical equation, 4 moles of P4 react with 3 moles of O2 to produce 2 moles of P4O6. Therefore, the number of moles of P4O6 that can be formed is:
n(P4O6) = 0.1803 mol O2 × (2 mol P4O6 / 3 mol O2) = 0.1202 mol P4O6
The limiting reactant is the reactant that produces the smaller amount of product, which in this case is white phosphorus (P4). Therefore, P4 is the limiting reactant.
(b) Since 4 moles of P4 react with 3 moles of O2 to produce 2 moles of P4O6, and the number of moles of P4O6 produced is 0.0233 mol, the number of moles of O2 that react is:
n(O2) = 0.0233 mol P4O6 × (3 mol O2 / 4 mol P4) = 0.0175 mol O2
The mass of P4O10 produced can be calculated using the number of moles of P4O6 that react in the second reaction, which is 0.0233 mol. Since the molar mass of P4O10 is 284 g/mol, the mass of P4O10 produced is:
m(P4O10) = n(P4O10) × M(P4O10) = 0.0233 mol × 284 g/mol = 6.61 g
Therefore, 6.61 g of P4O10 is produced.
(c) The number of moles of O2 that react in the first reaction is:
n(O2) = 0.0466 mol P4 × (3 mol O2 / 4 mol P4) = 0.0349 mol O2
The number of moles of O2 remaining after the first reaction is:
n(O2) excess = n(O2) initial - n(O2) reacted = 0.1803 mol - 0.0349 mol = 0.1454
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Use the periodic table to compare the sizes of ionic radii with the corresponding atomic radii or other ionic radii. Choose from smaller and larger in the blanks below: A sodium cation is than a sodium atom. A phosphorus anion is than a phosphorus atom. A magnesium ion is than a sodium ion. A chlorine ion is than a phosphorus ion. A potassium ion is than a sodium ion.
Answer:smaller larger smaller smaller larger
Explanation:
Just took the test on edge
Answer:
smaller
larger
smaller
smaller
larger
Explanation:
on edge
31.The following equation represents which of the following types of reaction?4 H3PO4 ---> P4 + 5 O2 + 6 H2OSelect one:a. Decomposition.b. Double replacement.c. Single replacement.d. Synthesis.
Answer
A. Decomposition.
Explanation
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
State two ways that active transport is different from diffusion.
Answer: Active transport goes against the gradient causing it to use ATP (energy) unlike diffusion which uses passive. Two types of diffusion are simple diffusion and facilitated diffusion, whereas two types of active transport are primary and secondary active transport.
Explanation: Active energy uses more energy to function rather than diffusion which has multiple types causing it to be different from active transport. Hope this helps!!
based on reactions 1 and 2, researchers interested in increasing the efficiency of the chromium(vi) removal process should add which compound to the untreated water? a. naoh b. hcl c. hclo4 d. kmn
substance should be added to the untreated water, according to reactions 1 and 2, if researchers want to improve the effectiveness of the chromium(vi) elimination procedure
What benefits does chromium provide the body?A crucial trace mineral called chromium can increase insulin sensitivity and improve protein, glucose, and lipid metabolism. It is a lustrous metal that people only require incredibly little amounts of.
What chromium side effects are there?Some reports have linked chromium to sporadic irregular heartbeats, sleep issues, migraines, mood swings, and allergic reactions. Damage to the kidneys or liver may be made more likely by chromium. Never use chromium without first consulting your doctor if you suffer from kidney or liver illness.
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A chemist is trying to classify an unknown substance as either a metal or nonmetal. What question should the chemist use to help classify the material?
A. Does the material feel hard to the
touch?
B. Does the material feel rough or smooth?
C. Is the material a good conductor or a poor conductor?
D. Will the material float in water?
Please Help me!!!
Answer:
c
Explanation:
metals are good conductors, while non metals are not good conductors
An old refrigerator is rated at 500 W how many kilowatt hours of electric energy what does refrigerator use in 30 days assume the refrigerator is running 12 hours per day
The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.
Given:
Power rating of the refrigerator = 500 W
Running time per day = 12 hours
Number of days = 30
First, we need to convert the power rating from watts to kilowatts:
Power rating = 500 W / 1000 = 0.5 kW
Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:
Energy used = Power rating × Running time × Number of days
Energy used = 0.5 kW × 12 hours/day × 30 days
Energy used = 180 kWh
Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
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3.2 g of a gas at occupy the same volume as 0.6266 g of CH4 at 17°C at constant pressure
Find the molecular mass of the gas.
Assuming gas temperature = 25, 3.2 g of a gas at 25°C occupy the same volume as 0.6266 g of CH4 at 17°C at constant pressure
The molecular mass of the gas : 842.1 g/mol
Find the molecular mass of the gas.Further explanationGiven
3.2 g of gas
0.6266 g of CH4
Required
the molecular mass of the gas
Solution
Because V, P, and R are the same, from ideal gas law :
PV=nRT
n₁T₁=n₂T₂
n₂=moles CH₄= 0.6266 : 16 g/mol = 0.0392
T₁=25+273=298 K
T₂=17+273=290 K
mol of gas :
\(\tt n_1=\dfrac{n_2.T_2}{T_1}=\dfrac{0.0392\times 290}{298}=0.038\)
molecular mass :
\(\tt M=\dfrac{3.2}{0.038}=842.1\)
A sample of hydrogen is collected in a flask over water. The partial pressures are 789 mmHg for H₂
and 60 mmHg for H₂O. What is the total pressure exerted by the mixture of gasses?
The total pressure of the gas is calculated as 849 mmHg.
What is partial pressure?The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.
In this case, the partial pressures of hydrogen and water are 789 mmHg and 60 mmHg respectively.
Thus, the total pressure of the gas = 60 mmHg + 789 mmHg = 849 mmHg.
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