Answer:
they reduce viral transmission
They prevent asymptomatic spread
You're protecting others from illness.
They're mandated by law in some states
They're good hygiene in general
what is the equilibrium constant for the following reaction? be sure your answer has the correct number of significant digits.
The equilibrium constant for the reaction 2SO2(g) + O2(g) → 2SO3(g) is Kc = 0.113.
This value is determined using the reaction quotient equation, which calculates the ratio of product concentrations to reactant concentrations at equilibrium.
The number of significant digits in the equilibrium constant is dependent on the number of significant digits in the concentrations of the reactants and products.
In this case, the concentration for each reactant and product is only known to two significant digits, so the equilibrium constant is also only known to two significant digits. As a result, the equilibrium constant for this reaction is Kc = 0.113.
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two chemicals a and b are combined to form a chemical c. the rate, or velocity, of the reaction is proportional to the product of the instantaneous amounts of a and b not converted to chemical c. initially, there are 40 grams of a and 50 grams of b, and for each gram of b, 2 grams of a is used. it is observed that 25 grams of c is formed in 6 minutes. how much (in grams) is formed in 12 minutes? (round your answer to one decimal place.) grams what is the limiting amount (in grams) of c after a long time? grams how much (in grams) of chemicals a and b remains after a long time? a grams b grams
In 12 minutes, approximately 50 grams of chemical C is formed.
The rate of the reaction is proportional to the product of the instantaneous amounts of chemicals A and B not converted to chemical C. Initially, there are 40 grams of A and 50 grams of B. For each gram of B, 2 grams of A is used. In 6 minutes, 25 grams of C is formed.
To find the amount of C formed in 12 minutes, we can use the concept of proportionality. Since the rate is proportional to the product of the amounts of A and B, and we know the rate of C formation in 6 minutes, we can set up the following proportion:
(25 grams of C) / (6 minutes) = (x grams of C) / (12 minutes)
By cross-multiplying and solving for x, we can determine that approximately 50 grams of C is formed in 12 minutes.
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Why did you have to use subtraction to find each object's volume?
Answer:
mathematics is important
Estimate the ΔH (kcal/mol) for the reaction of hydrogen and oxygen to form water: 2 H2 + O2 2 H2O ΔH = ?
To estimate the deltaH for the reaction we can do it from the bond energies, that is, starting from the energy needed to form or break a bond.
The reaction energy will be equal to the binding energy of the reactants minus the binding energy of the products. To calculate each bond energy we must first identify which bonds are involved in the reaction. They give us a balanced reaction:
\(2H_2+O_2\rightarrow2H_2O\)For the reaction, we have the following bonds
\(\begin{gathered} 2\lbrack H-H\rbrack+1\lbrack O=O\rbrack\rightarrow2\lbrack H-O-H\rbrack \\ 2\lbrack H-H\rbrack+1\lbrack O=O\rbrack\rightarrow2\times2\lbrack O-H\rbrack \end{gathered}\)Now we are going to calculate the energy taking into account the values that we can find in tables of the bond energy.
Bond Ee (kJ/mol)
H - H 436
O=O 499
O - H 460
Therefore the energy on each side of the reaction will be:
\(\begin{gathered} 2\lbrack H-H\rbrack+1\lbrack O=O\rbrack\rightarrow2\times2\lbrack O-H\rbrack \\ 2\times436\frac{kJ}{mol}+1\times499\frac{kJ}{mol}\rightarrow2\times2\times460\frac{kJ}{mol} \\ 1371\frac{kJ}{mol}\rightarrow1840\frac{kJ}{mol} \end{gathered}\)The reaction energy will be:
\(\begin{gathered} \Delta H_r=\Delta H_{Reac\tan ts}-\Delta H_{Products} \\ \Delta H_r=1371\frac{kJ}{mol}-1840\frac{kJ}{mol}=-469\frac{kJ}{mol} \end{gathered}\)We have an exothermic reaction since the result is negative. This means that the energy of the products is greater than that of the reactants.
Now we will convert the energy units to kcal:
\(\Delta H_r=-469\frac{kJ}{mol}\times\frac{1\text{kcal}}{4.184kJ}=-112\frac{kcal}{\text{mol}}\)ΔH (kcal/mol) estimated of the reaction will be -112kcal/mol
What is the Hf for this reaction? 16CO2(g) + 18H2O(g) 2C8H18(l) + 25O2(g)
Answer:
10,148
Explanation:
To solve this we must be knowing each and every concept related to Enthalpy. Therefore, 10,148KJ/mol is the ΔH for formation for the reaction 16CO\(_2\)(g) + 18H\(_2\)O(g) \(\rightarrow\) 2C\(_8\)H\(_{18}\)(l) + 25O\(_2\)(g)
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance.
The balanced equation for the given chemical reaction can be given as
16CO\(_2\)(g) + 18H\(_2\)O(g) \(\rightarrow\) 2C\(_8\)H\(_{18}\)(l) + 25O\(_2\)(g)
ΔH for formation= 10,148KJ/mol
Therefore, 10,148KJ/mol is the ΔH for formation for the reaction 16CO\(_2\)(g) + 18H\(_2\)O(g) \(\rightarrow\) 2C\(_8\)H\(_{18}\)(l) + 25O\(_2\)(g)
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match the element with its number of valence electrons. group of answer choices nitrogen [ choose ] silicon [ choose ] oxygen [ choose ] magnesium [ choose ]
The electrons in an atom that are in orbits away from the nucleus are called valence electrons. Nitrogen: 5, Silicon: 4, Oxygen: 6, Magnesium: 2.
What exactly is a positive electron and why is it significant?Valence electrons are the electrons that reside in an atom's outermost shell. The role of valence electrons in controlling an atom's reaction makes them crucial. By writing an octet, you'll be enabled see how many protons fill the highest amount of energy.
What is valence defined simply?In chemistry, valence, sometimes called valency, is a characteristic of an element who establishes how many other atoms of the element each atom can interact with. The phrase, which was first used in 1868, is used to represent both the broad capability of pairing of an element and its numerical value.
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a sci2 molecule has __ bonds and a __ molecular shape. As a result, SCI2 molecule is ___
what is the molar concentration of a solution made by dissolving 42.5 g of nacl in enough water to form 0.700 l of solution? the molar mass of nacl is 58.44 g/mol .
The molar concentration of a solution made by dissolving 42.5 g of NaCl in enough water to form 0.700 l of solution. the molar mass of NaCl is 58.44 g/mol is 1.02 M.
given that :
mass = 42.5 g
molar mass = 58.44 g/mol
number of moles of NaCl = 42.5 / 58.44
= 0.72 mol
molar concentration = number of moles / volumes in L
= 0.72 / 0.70
= 1.02 M
Thus, The molar concentration of a solution made by dissolving 42.5 g of NaCl in enough water to form 0.700 l of solution. the molar mass of NaCl is 58.44 g/mol is 1.02 M.
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What is the mass of 1. 84 mol NaCl? Give your answer to the correct number of significant figures. (Molar mass of NaCl = 58. 44 g/mol) 1. 84 mol NaCl = g NaCl.
The mass of 1. 84 mol NaCl is 107.52 g.
Moles have been defined as a mass of substance with respect to the molar mass. The moles can be given as:
\(\rm Moles=\dfrac{Mass}{Molar\;mass}\)
Computation for mass of NaClThe given molar mass of NaCl is 58. 44 g/mol.
The given moles of NaCl is 1. 84 mol
Substitute the values for mass of NaCl:
\(\rm 1. 84 \;mol=\dfrac{Mass}{58. 44 \;g/mol} \\\\Mass= 1. 84 \;mol\;\times\;58. 44 \;g/mol\\\\Mass=107.52\;g\)
The mass of 1. 84 mol NaCl is 107.52 g.
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some acids such as carbonic acid decompose to nonmetal oxides and
a. water b. a salt
c. oxygen d. peroxide
When carbonic acid (H2CO3) decomposes, it yields nonmetal oxides and water. The decomposition reaction of carbonic acid produces carbon dioxide (CO2) and water (H2O).
This process occurs when carbonic acid loses a water molecule, leading to the formation of carbon dioxide gas and water. The carbon dioxide is a nonmetal oxide, while water is a compound resulting from the combination of hydrogen and oxygen.
Therefore, when carbonic acid undergoes decomposition, the products formed are nonmetal oxide (carbon dioxide) and water.
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if you were given lithium and beryllium, predict which element would react more vigorously with water to produce hydrogen gas. explain your answer. (3 pts)
Lithium is the element that reacts more vigorously with water to produce hydrogen gas.
Explanation: The reactivity of metals with water is referred to as "metal-water reaction." Hydrogen gas is produced when a metal reacts with water. Lithium, which is an alkali metal, is highly reactive and will react with water at normal temperatures; hence, it is the most reactive of the alkali metals. Beryllium, on the other hand, does not react with water because its surface is protected by an oxide layer formed by air. The reaction of lithium with water produces a white solid compound known as lithium hydroxide and hydrogen gas. The reaction equation is as follows: 2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g)The reaction is highly exothermic and releases a lot of heat. As a result, the hydrogen produced may ignite, and the reaction may become explosive. This makes lithium highly reactive with water, producing hydrogen gas as well as fire. This is the reason why lithium metal is usually stored in oil to protect it from the water vapor present in the atmosphere.
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fill in the blanks with the coefficients for the balanced version of the following equation: sno2 h2→sn h2o
The balanced equation is SnO₂ + 5/2 H₂ → Sn + 3/2 H₂O.
To balance the equation: SnO₂ + H₂ → Sn + H₂O, we need to ensure that the number of atoms on both sides of the equation is equal.
Start by balancing the atoms of elements that appear in only one compound on each side. In this case, we have tin (Sn) and oxygen (O). We have one Sn on the right side, so we need to balance it with a coefficient of 1 on the left side.
Next, balance the oxygen atoms. We have two O atoms in SnO₂ and one O atom in H₂O, giving us a total of three O atoms on the left side. To balance this, we place a coefficient of 3/2 in front of H₂O, resulting in 3/2 H₂O.
Now, balance the hydrogen (H) atoms. We have four H atoms in H₂ and one H atom in 3/2 H₂O, giving us a total of 5/2 H atoms on the left side. To balance this, we place a coefficient of 5/2 in front of H₂, resulting in 5/2 H₂.
The balanced equation is: SnO₂ + 5/2 H₂ → Sn + 3/2 H₂O.
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Help meeeeeeeeeeewweeee
Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.
Hope This Helps You ❤️what product of an acid base reaction is an ionic compound
A. water
B. a metal
C. a gas
D. a salt
The product of an acid-base reaction that is most likely to be an ionic compound is a salt. Option D).
In an acid-base reaction, the product that is most likely to be an ionic compound is a salt. A salt is formed when an acid reacts with a base, resulting in the transfer of ions between the two reactants. Acids typically release hydrogen ions (H+) when dissolved in water, while bases release hydroxide ions (OH-). When these ions combine, they form water (H2O), which is a neutral molecule.
However, in addition to water, the reaction between an acid and a base also produces a salt. A salt is an ionic compound composed of positive and negative ions. The positive ion usually comes from the base, while the negative ion comes from the acid. The combination of these ions results in the formation of an ionic compound, which is commonly referred to as a salt.
Therefore, the product of an acid-base reaction that is most likely to be an ionic compound is a salt. Hence option D) is correct.
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Select the statements below that are true when an ice cube is placed in a glass of hot water.Choose one or more:DA qice qwater=B. qwater = -qiceOC. The energy gained by the ice cube will be equal to the energy lost by the water.D. Thermal energy will flow from the ice cube to the water.OE. The energy lost by the ice cube will be equal to the energy gained by the water.F. Thermal energy will be transferred from the water to the ice cube.
In this question, we have a situation where an ice cube is placed in a glass of hot water, which means we have a situation of exothermic and endothermic reactions occurring.
The endothermic reaction will be related to the ice cube, since this cube will increase its temperature, and in order to do that, the cube needs to absorb energy, and this thermal energy will come from the hot water
The exothermic reaction is the hot water releasing this thermal energy to its surroundings, and then the temperature will decrease as well
The options that are the answers will be:
C
F
Letter B should be the opposite, -qwater = qice, and letter A doesn't show the positive or negative sign
__NaCI + __F2=__NaF + __CI2
Answer:
2 NaCl 2 + F2 = 2NaF + 2Cl2
An ion has 56 protons, 54 electrons, and 81 neutrons. What is the
element's symbol?
Explanation:
The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.
if we have 2.00 mol of n2 reacting with sufficient h2 , how many moles of nh3 will be produced?
When 2.00 moles of N2 react with sufficient H2, the balanced chemical equation for the synthesis of ammonia (NH3) is N2(g) + 3H2(g) → 2NH3(g).
According to the stoichiometry of the reaction, 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Since you have 2.00 moles of N2 reacting, you can use the mole ratio to determine the moles of NH3 produced:
(2 moles NH3 / 1 mole N2) × 2.00 moles N2 = 4.00 moles NH3,
So, when 2.00 moles of N2 react with sufficient H2, 4.00 moles of NH3 will be produced.
38.5 g is the mass of nitrogen.
generated moles of ammonia Chemical formula
N₂ + 3H₂ → 2NH₃
Number of nitrogen moles: Mass x molar mass equals number of moles 38.5 g/28 g/mol is the weight in moles.
1.375 mol is the number of moles.
The moles of ammonia and nitrogen from the balance chemical equation will now be compared.
N₂ : NH₃ 1 : 2
1.375 : 2×1.375 = 2.75 mole..Thus, from 38.5 g of nitrogen, 2.75 moles of ammonia are created.
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Which of the two substances would have a higher melting point: O2 or quartz (SiO2)n? Explain your answer.
Answer:
quartz (SiO2)n
Explanation:
Melting point is defined as the temperature or point at which the substances change its state from solid to liquid.
Quartz (SiO2)n has high melting point than O2 because Quartz (SiO2)n is found in the form of hard, crystalline mineral that is made up of silicon and oxygen atoms having strong covalent bonds between all the atoms. So, a lot of energy is required to break the bond between the atoms and it has a high melting point.
Hence, the correct answer is quartz (SiO2)n.
"Earth and Life Science"
Write at least three (3) expectations. What are your expectations for this subject?
Consider the following reaction in a gas phase:C(s) + H2O(g) ⇄ CO(g) + H2(g) KC = 0. 2 at 1000 °CCalculate the concentration of CO in an equilibrium mixture (in mol/L) if a reaction mixture initially contains only reactants, and the equilibrium concentration of H2O(g) is [H2O] = 0. 500 M at 1000 °C
The concentration of CO (g) in the equilibrium mixture is 0.020 M. In other words, only a small amount of CO (g) is produced in this reaction at 1000°C. T 0.020 M.
The concentration of CO in an equilibrium mixture (in mol/L) is 5.8 M.
Given that the concentration of H2O (g) is [H2O] = 0.500 M at 1000°C, and the reaction is:
C(s) + H2O(g) ⇄ CO(g) + H2(g) KC = 0.2 at 1000°C
We need to determine the concentration of CO in an equilibrium mixture (in mol/L)
if a reaction mixture initially contains only reactants.
We can solve this problem using the ICE table method as follows:
Let x be the change in concentration of H2O (g) and CO (g) when they reach equilibrium.
Then the equilibrium concentrations of CO (g) and H2 (g) are equal to x. Hence, the equilibrium concentration of H2O (g) is (0.500 - x) M. Substitute these values in the expression for Kc and solve for x.
Kc = [CO (g)] [H2 (g)] / [H2O (g)] [C (s)]
= 0.2[CO (g)] = Kc [H2O (g)] [C (s)] / [H2 (g)]
= 0.2 × (0.500 - x) / x
We can simplify this expression by cross-multiplication to get:
5x = 0.1 - 0.2xx = 0.02 M
Substituting x = 0.02 M in the expression for [CO (g)], we get:
[CO (g)] = 0.2 × (0.500 - 0.02) / 0.02 = 5.8 M (approx.)
Therefore, the concentration of CO (g) in an equilibrium mixture (in mol/L) is 5.8 M. The problem requires us to find the equilibrium concentration of CO (g) in a mixture that initially contains only reactants.
To solve this problem, we need to use the expression for the equilibrium constant Kc, which is given by:
Kc = [CO (g)] [H2 (g)] / [H2O (g)] [C (s)]
We can also use the ICE table method to solve this problem. In this method, we start with the initial concentration of the reactants and calculate the change in concentration of each species as they reach equilibrium.
We then use the equilibrium concentrations to calculate the value of Kc and solve for the unknowns. Here is how we can set up the ICE table for this problem: Reaction:
C(s) + H2O(g) ⇄ CO(g) + H2(g)
Initial: [C] = [H2]
= 0 M,
[H2O] = 0.500 M
Equilibrium: [C] = [H2] = x,
[H2O] = 0.500 - x,
[CO] = [H2] = x
Change: +x +x -x -x
Substituting the equilibrium concentrations into the expression for Kc, we get:
Kc = [CO] [H2] / [H2O] [C]
= x² / (0.500 - x)
= 0.2
Solving for x, we get: x = 0.020 M
Substituting this value of x into the expression for [CO], we get:
[CO] = x = 0.020 M
Therefore, the concentration of CO (g) in the equilibrium mixture is 0.020 M.
In other words, only a small amount of CO (g) is produced in this reaction at 1000°C. T 0.020 M.
The concentration of CO in an equilibrium mixture (in mol/L) is 5.8 M.
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Describe Connections in a Text
Describe the connection between coal power and nuclear power from Turn on the Power. Use the
ideas from the Compare Ideas in a Text activity to describe how the ideas are alike and different.
Coal power and nuclear power are
alike because they both...
Coal power and nuclear power are
different because coal power...
and nuclear power...
Answer:
thanks
Explanation:
What is the frequency of a red laser that has a wavelength of 676 mn
The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
Frequency of wavesThe frequency and wavelength of a wave are related by the following equation:
λf = c
Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.
in this case, λ = 676 nm = 6.76 x \(10^{-7\) m
c = 299,792,458 m/s
Making f the subject of the formula:
f = c/λ
= 299,792,458/6.76 x \(10^{-7\)
= 4.43 x \(10^{14\) hertz
In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.
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What unit is mass generally measured in
Answer:
kilograms
Explanation:
hope this helps, pls mark brainliest :D
Answer:kilogram
Explanation:
I got the smarts
Which of the following has the ability to cause motion and create change?
Energy
Space
Sound
Mass
Answer: Energy has the ability to cause motion and create change.
Give one example of each of the following, that happens to us in our everyday life: Explain a bit about the science behind it, so for example, for melting you can say ice cream melting in your hand, which turns from a solid to a liquid, which is melting. If you are unsure please do not answer, though if you are confident please be free to do so! Have a wonderful day or night!
a) Melting:
b) Freezing:
c) Condensation:
d) Evaporation:
e) Sublimation.
a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.
b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.
c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.
d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.
e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.
a) Melting: Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.
b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.
c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.
d) Evaporation: As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.
e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.
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a 30.5-g sample of ca contains how many calcium atoms?
Answer:
Explanation:
To find the number of calcium atoms in a 30.5-g sample, we need to use the molar mass of calcium and Avogadro's number.
The molar mass of calcium (Ca) is approximately 40.08 g/mol.
First, let's find the number of moles of calcium in the 30.5-g sample:
moles = (mass of the sample) / (molar mass of Ca)
moles = 30.5 g / 40.08 g/mol ≈ 0.7607 moles
Now, we will use Avogadro's number (6.022 x 10^23 atoms/mol) to find the number of calcium atoms in the sample:
number of atoms = (number of moles) × (Avogadro's number)
number of atoms = 0.7607 moles × 6.022 x 10^23 atoms/mol ≈ 4.58 x 10^23 atoms
So, the 30.5-g sample of calcium contains approximately 4.58 x 10^23 calcium atoms.
Explain why the alloy is more brittle
The nuclei in the alloy are not all the same size. This means
that if the layers of atoms do move, the alignment of the
nuclei will not be favourable. This causes [ answer ]
forces to form and these will cause the metal to break apart.
An alloy is made of two or more different metals.These metals are of different sizes. This cause a distortion in the system and leads to a slide of of atoms when a force is applied and make it brittle.
What are alloys?Alloys are mixed metals. They are widely used in constructions, in electronic devices and in other industries due to their potential application superior over the pure metals.
There are atoms of various sizes in an alloy. The layers of atoms in pure metal are distorted by the smaller or larger atoms. This indicates that more force is needed to get the layers to slide over one another. Compared to pure metal, the alloy is tougher and more durable.
The irregularity of the atoms that make up high-entropy alloys is what gives is their immense strength. When the alloy is deformed, this disorder makes it difficult for the alloy's dislocation flaws to migrate through its crystal structure. But under adequate pressure, this also makes the alloy highly brittle.
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12.7 l of argon at 33°c and 735 torr are dissolved in enough water to give a final volume of 0.750 l. what is the molarity of the resulting solution
a. 6.02 M
b. 0.652 M
c. 0.0644 M
d. 0.489 M
e. 4.95 M
Option (b) is correct. The molarity of the resulting solution is 0.652 M. This is calculated using the expression of ideal gas equation and molarity.
12.7 l of argon at 33°c and 735 torr are dissolved in enough water to give a final volume of 0.750l. so,
P = 735.0 torr
= (735.0/760) atm.
= 0.9671 atm.
V = 12.7 L
T = 33.0 o C
= (33.0+273) K
= 306 K
We can find the number of moles using ideal gas equation. The ideal gas law, also called the general gas equation, is the equation of state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions. The ideal gas equation is,
P * V = n*R*T
0.9671 atm. * 12.7 L = n * 0.08206 atm. L/mole . K * 306 K
n = 0.4891 mole
Now, we will calculate Molarity. Molarity or molar concentration is the number of moles of solute per liter of solution, which can be calculated using the following equation,
Molarity = number of mole / final volume
= 0.4891 mole / 0.750 L
= 0.652 M
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who anyoneis going to help me with science please and if the perfect the score i will brainlist u and follow u but please be serius in answer(༎ຶ ෴ ༎ຶ)
Answer:
See below
Explanation:
1. homogeneous
2. homogeneous
3. heterogeneous
4. heterogeneous
5. homogeneous
6. homogeneous
7. heterogeneous
8. heterogeneous
9. heterogeneous
10. homogeneous