If I add 200 mL of water to 600 mL of 16 M HNO3 what will the solution's final molarity be?
12M HNO3
Explanation:
A 600-ml solution of 16M nitric acid contains
16M HNO3 × 0.6 L = 9.6 m HNO3
so by increasing the volume by 200 ml the molarity of the solution becomes
Molarity = (9.6 mol HNO3)/(0.800 L)
= 12M HNO3
List the four states of matter, from top to bottom, in order of decreasing energy.
They are. solids liquids gases and plasma. and fift one in man made.
10.
Given the following reaction
Ca(s) + 2HCl(aq) → CaCl2(aq) + H2(g)
If 1.00 g of Ca reacts with 1.00 g HCI and 1.21 g CaCl2 are produced, what is the theoretical yield, the percent
yield and the limiting reactant?
a. 2.77 g, 43.7%, Ca limiting
b. 2.77 g, 79.5%, HCI limiting
c. 1.52 g, 43.7%, Ca limiting
d. 1.52 g, 79.5% HCI limiting
e. 2.77g, 54.9%, Ca limiting
f. 1.52 g, 54.9%, HCI limiting
The given reaction is calcium, solid, plus 2 h c, l gives c a c l, 2 plus hydrogen. Here we can write 1 mole of calcium, reacting with 2 moles of h, c l ...
Given the following reaction Ca(s) + 2HCl(aq) → CaCl2(aq) + H2(g) If 1.00 g of Ca reacts with 1.00 g HCI and 1.21 g CaCl2 are produced,
14.18 an alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a degree of polymerization of 3420. if one of the repeat units is styrene, which of ethylene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? why?'
An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a degree of polymerization of 3420. if one of the repeat units is styrene, which of ethylene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? why?'
Propylene (C3H6) is a colorless gasoline gas with a naturally stinky odor. even though just like propane, it has a double bond which gives it a combustion gain i.e. it burns warmer. This fuel gasoline is extremely flammable and non-poisonous. Propylene is obtained throughout the refining of gas.
Gasoline is a aggregate of many different hydrogen- and carbon- containing chemicals (hydrocarbons). a typical fuel mixture includes about one hundred fifty exclusive hydrocarbons, including butane, pentane, isopentane and the BTEX compounds (benzene, ethylbenzene, toluene, and xylenes)
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If there are 3 moles of Pb, how many particles of Pb3N2 are there in the balanced equation? *
In the balanced equation for the reaction of Pb with N2, 3 moles of Pb would react with 2 moles of N2 to form 6 moles of Pb3N2. Since 1 mole of a substance is equal to 6.02x1023 particles, 3 moles of Pb would be equal to 1.81x1024 particles of Pb.
Similarly, 2 moles of N2 would be equal to 1.21x1024 particles of N2. When these two react to form Pb3N2, 6 moles of Pb3N2 would be formed, which is equal to 3.63x1024 particles of Pb3N2. Thus, if there are 3 moles of Pb, then there are 3.63x1024 particles of Pb3N2.
Molecules and atoms are the building blocks of all matter in the universe. A mole is a unit of measurement used to quantify the amount of a substance present in a given sample. It is defined as the amount of substance that contains the same number of particles as 12 grams of Carbon-12.
Moles are used to calculate the number of particles present in a given amount of a substance, as the number of particles in a mole of a substance is always the same. This allows us to easily calculate the number of particles present in any given amount of a substance.
In chemistry, the balanced equation of a reaction is used to calculate the amount of each reactant and product present in the reaction. Knowing the number of moles of each substance present in the reaction allows us to calculate the number of particles present in each substance as well.
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select all that are true
A
The central atom of any valid Lewis electron-dot structure must have a minimum of eight valence
electrons.
B
G. N. Lewis based his electron-dot model for chemical bonding on the fact that all noble gases have
ns²npa valence configurations (except hydrogen, which is 1s2).
es?
С
For the most part, electron-dot structures show electrons in pairs, but there are exceptions.
rotons
D
One of the points in favor of acceptance of the quantum mechanical model is that it explains why
Lewis' electron dot model works so well.
E
Lewis showed valence electrons as being paired up because a maximum of two electrons can
occupy a given valence orbital.
F
Lewis used the "duet rule" and the "octet rule" in drawing his electron-dot structures. This
corresponds to the fact that in each period, the representative elements are in rows of two or eight
elements.
calculate the concentration of h3o ions present in a solution of hcl that has a measured ph of 6.310 . m
Concentration of H3O+ = 4.898 X 10^-7 M
What is concentration of H3O+ ?
The reverse of the mathematical method used to determine the pH can be used to determine the hydronium ion concentration from the pH . or [H3O+] = antilog (- pH), or [H3O+] = 10-pH (- pH)
As a result of the reaction between the ions of the acid and the water, which produces H2O, the concentration of hydronium ions will decrease with dilution. A solution becomes less acidic as a result of the drop in hydronium ion concentration.
pH = -log [ H+]
[H+] =
Concentration of H3O+ = 4.898 X 10^-7 M
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pleassseeeee i’ll give brainiest!!!!!!!!
2KCIO3= 2KCI+3O2
Using the equation above, if 25.6 g of KClare produced, then how many grams of
KCIO3 were consumed? (Type the numerical answer only, no words or label. Use
correct significant figures)
Answer:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Explanation:
hope this helped :)
How do you arrange elements in order of increasing size?
Elements can be arranged in order of increasing size by following the periodic table. The periodic table arranges elements in increasing atomic number, which generally correlates with increasing size. However, there are exceptions due to the presence of different electron configurations and the effects of nuclear charge.
To arrange elements in order of increasing size, you can follow these steps:
Locate the elements on the periodic table.Compare the period (horizontal row) of the elements. Elements in lower periods will generally be smaller in size.If the elements are in the same period, compare the group (vertical column) of the elements. Elements in lower groups will generally be larger in size.Consider any exceptions due to electron configurations and nuclear charge.By following these steps, you can arrange elements in order of increasing size.
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A protein structure contains a flexible loop with two accessible conformations that differ in energy by 5 kJ/mol. What percentage of the protein will have the loop region in the higher energy conformation? A. At 300 K ? B. At 350 K ? 4. (4 pts) What is the potential energy for the interaction between two atoms using empirical potential energy functions to model a covalent bond. A. Use the Morse potential with D=1,000 kJ/mol,a=2
A
˚
−1
and r
0
=1.0
A
˚
. i. For r=0.9
A
˚
? ii. For r=1.5
A
˚
? B. Use the Hooke's law with K
B
=5,000 kJ⋅mol
−1
⋅
A
˚
−2
and r
0
=1.0
A
˚
. i. For r=0.9
A
˚
? ii. For r=1.5
A
˚
? 5. (4 pts) What is the potential energy for a salt bridge interaction between lysine and glutamate residues at a distance of 3.0
A
˚
. Assume both residues have elementary charges of +1 and −1, respectively. A. For the interaction on the protein surface use dielectric constant, ε=80. B. For the interaction in the protein interior use dielectric constant, ε=2.
The solution for the given question on potential energy is given below.
4. (a) To determine the percentage of the protein in the higher energy conformation at 300 K and 350 K, we can use the Boltzmann distribution formula:
\(\[ P = \frac{e^{-\frac{\Delta E}{kT}}}{Z} \times 100 \]\)
where:
- P is the percentage of the protein in the higher energy conformation
- \(\( \Delta E \)\) is the energy difference between the two conformations (5 kJ/mol)
- k is the Boltzmann constant \((\( 8.314 \, \text{J/(mol.K)} \))\)
- T is the temperature in Kelvin
- Z is the partition function
For 300 K:
\(\[ P_{300K} = \frac{e^{-\frac{5 \times 10^3}{8.314 \times 300}}}{1 + e^{-\frac{5 \times 10^3}{8.314 \times 300}}} \times 100 \]\)
For 350 K:
\(\[ P_{350K} = \frac{e^{-\frac{5 \times 10^3}{8.314 \times 350}}}{1 + e^{-\frac{5 \times 10^3}{8.314 \times 350}}} \times 100 \]\)
5. (a) The potential energy for the interaction between two atoms can be calculated using different empirical potential energy functions.
(i) For the Morse potential:
\(\[ E_{\text{Morse}} = D \left(1 - e^{-a(r - r_0)}\right)^2 \]\)
For \(\( r = 0.9 \, \text{Å} \)\):
\(\[ E_{\text{Morse}} = 1000 \left(1 - e^{-2(0.9 - 1.0)}\right)^2 \]\)
(ii) For \(\( r = 1.5 \, \text{Å} \)\):
\(\[ E_{\text{Morse}} = 1000 \left(1 - e^{-2(1.5 - 1.0)}\right)^2 \]\)
(b) For Hooke's law:
\(\[ E_{\text{Hooke}} = \frac{1}{2} K (r - r_0)^2 \]\)
For \(\( r = 0.9 \, \text{Å} \)\):
\(\[ E_{\text{Hooke}} = \frac{1}{2} \times 5000 \times (0.9 - 1.0)^2 \]\)
For \(\( r = 1.5 \, \text{Å} \)\):
\(\[ E_{\text{Hooke}} = \frac{1}{2} \times 5000 \times (1.5 - 1.0)^2 \]\)
5. (a) For the salt bridge interaction on the protein surface with a dielectric constant \((\( \varepsilon \))\) of 80, the potential energy can be calculated using the Coulomb's law:
\(\[ E_{\text{Coulomb}} = \frac{q_1 q_2}{4\pi\varepsilon r} \]\)
where \(\( q_1 \)\) and \(\( q_2 \)\) are the charges of the interacting residues (+1 and -1, respectively), \(\( \varepsilon \)\) is the dielectric constant, and r is the distance.
For \(\( r = 3.0 \, \text{Å} \)\):
\(\[ E_{\text{Coulomb}} = \frac{(1)(-1)}{4\pi \times 80 \times 3.0} \]\)
5. (b) For the salt bridge interaction in the protein interior with a dielectric constant \((\( \varepsilon \))\) of 2, the potential energy can be calculated using the Debye-Hückel equation:
\(\[ E_{\text{Debye-Huckel}} = \frac{q_1 q_2}{4\pi\varepsilon r} \cdot e^{-\kappa r} \]\)
where \(\( \kappa \)\) is the Debye screening constant, which depends on the ionic strength of the medium.
For \(\( r = 3.0 \, \text{Å} \)\):
\(\[ E_{\text{Debye-Huckel}} = \frac{(1)(-1)}{4\pi \times 2 \times 3.0} \cdot e^{-\kappa \times 3.0} \]\)
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A gas is heated from 213.0 K to 398.0 K and the volume is increased from 13.0 liters to 35.0 liters by moving a large piston within a cylinder. If the original pressure was 3.15 atm, what would the final pressure be?
Answer:
P₂ = 0.13880 atm
Explanation:
Given info are;
Initial volume = 13.0 L
Initial pressure = 3.15 atm
Initial temperature = 213.0 K
Final temperature = 398.0 K
Final volume = 35.0 L
Final pressure = ?
Note;
Base on general gas equation:
P₁V₁/T₁ = P₂V₂/T₂
Formula = P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressureV₁ = Initial volumeT₁ = Initial temperatureP₂ = Final pressureV₂ = Final volumeT₂ = Final temperatureSolution:
P₂ = P₁V₁ T₂/ T₁ V₂
P₂ = 3.15 atm x 13.0 L x 398.0k/213.0 k x 35.0 L
P₂ = 1034.8 atm .L.K/ 7455 K.L
P₂ = 0.13880617035
P₂ = 0.13880 atm
When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.
Thus we will include five significant figures in answer because 1034.8 have five significant figure.
[RevyBreeze]
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of gas is 0.13880 atm .
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
Combining Boyle's and Charles' gas law
P₁V₁/T₁ = P₂V₂/T₂
P₂ = P₁V₁ T₂/ T₁ V₂
P₂ = 3.15 atm x 13.0 L x 398.0k/213.0 k x 35.0 L
P₂ = 1034.8 atm .L.K/ 7455 K.L
P₂ = 0.13880617035
P₂ = 0.13880 atm
Therefore the new pressure of gas is 0.13880 atm when the temperature is changed to 398.0 K and volume is increased to 35.0 liters.
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what volume of a 15.0% by mass naoh solution, which has a density of 1.116 g/ml , should be used to make 5.20 l of an naoh solution with a ph of 10.0?
The volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/ml, should be used to make 5.20 l of a NaOH solution with a ph of 10.0 is 3.47 L.
To find the volume of a 15.0% by mass NaOH solution, we need to use the following formula:
mass = volume x density x percentage by mass
We know the density of the solution is 1.116 g/ml and the percentage by mass is 15.0%. Let's assume the mass of the solution we need is x.
x = volume x 1.116 g/ml x 15.0%
Simplifying this equation, we get:
x = 0.1674 volume
Now, let's move on to the second part of the question. We need to make a 5.20 L solution of NaOH with a pH of 10.0. To do this, we need to calculate the concentration of NaOH we need in the final solution.
The pH of a solution can be calculated using the following formula:
pH = -log[H+]
Since we want the pH to be 10.0, we can rearrange this equation to find the concentration of H+ ions we need:
[H+] = 10^-pH
[H+] = 10^-10
[H+] = 1.0 x 10^-10 M
Now, NaOH is a strong base that will dissociate completely in water to form Na+ and OH- ions. The concentration of OH- ions in our final solution will be equal to the concentration of NaOH we add to the solution.
So, to make a 5.20 L solution of NaOH with a pH of 10.0 and a concentration of 1.0 x 10^-10 M, we need to add:
the volume of NaOH = (concentration x volume of solution) / percentage by mass
volume of NaOH = (1.0 x 10^-10 M x 5.20 L) / 15.0%
volume of NaOH = 3.47 L
Therefore, we need to use 3.47 L of the 15.0% by mass NaOH solution to make 5.20 L of a NaOH solution with a pH of 10.0.
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Which of the following is NOT a correct formula unit for a salt made from main group elements?
Group of answer choices
KF
Na2S
Ca2O
Mg3N2
The formula unit of a salt that is not correct is \(Ca_{2} O\) in option C.
What is a salt?A salt is almost always made up of a metal and a nonmetal element. The salts as we know them are mostly ionic in nature and they are known to be able to dissolve in solution when they are put into solution.
We know that the salt that they meant to show in option C is calcium oxide and the foregoing can not be the correct formula since both the calcium and the oxygen ions are divalent. The correct formula of the salt would be CaO.
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QUICK CHECK
Use the periodic table to select which type of bond is present and which of the listed properties is most
likely for each substance.
Substance
Type of bond
Likely property
A А
B
A
Cuzm
Ba
lonic
DO
covalent
02
С
D
metallic
Answer:
Coppell zinc,ironic bond
Explanation:
lt will give away two zinc atoms
Answer:
I will go with Sodium chlorine NaCl
Emma wants to go swimming the first day the pool opens in May, but she is worried it will be too cold since summer only just started. She only likes to swim in the water if the pool is at least 82°F. The thermometer in the pool reads 24°C. Is the pool warm enough for Emma to swim in? Show all work to support your answer.
Answer:
the water is not warm enough for her
Explanation:
Given that
Her preferred temperature = 82°F
Thermometer in water reads = 24°C
Convert the preferred temperature to °C
°C=5/9 (82-32)
°C = 27.8 °C
Hence the water is not warm enough for her
The water is not warm enough for her to swim in.
She loves to swim in water at temperature = 82°F.Thermometer in water reads = 24°C.We have to convert Emma's preferred temperature to °C
°C= 5/9 x (F - 32)
°C=5/9 (82-32)
°C = 27.8
Therefore the temperature is 27.8°C
This means that the temperature of the water is not warm enough for her
to swim in.
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A 3. 8
g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10. 5
g. The two substances react, releasing carbon dioxide gas to the atmosphere. After the reaction, the contents of the reaction vessel weigh 11. 7
g. What is the mass of carbon dioxide released during the reaction?
The mass of carbon dioxide released during the reaction is 2.6 grams.
To determine the mass of carbon dioxide released during the reaction between sodium hydrogen carbonate (NaHCO3) and acetic acid (CH3COOH), we need to calculate the difference in mass before and after the reaction.
Before the reaction:
Mass of NaHCO3 = 3.8 g
Mass of acetic acid = 10.5 g
Total mass before the reaction = Mass of NaHCO3 + Mass of acetic acid = 3.8 g + 10.5 g = 14.3 g
After the reaction:
Mass of the contents of the reaction vessel = 11.7 g
To find the mass of carbon dioxide released, we calculate the difference in mass:
Mass of carbon dioxide released = Total mass before the reaction - Mass of the contents of the reaction vessel
= 14.3 g - 11.7 g
= 2.6 g
Therefore, the mass of carbon dioxide released during the reaction is 2.6 grams.
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PLEASE HELP!!
How many moles are present in 431.56 grams of sodium bicarbonate ( NaHCO3)?
Molar mass of sodium bicarbonate (NaHCO3) = 84.01 g/mol
Answer:
5.14mole
Explanation:
Given parameters:
Mass of sodium bicarbonate = 431.56g
Unknown:
Number of moles = ?
Solution:
To find the number of moles, we use the expression below:
Number of moles = \(\frac{mass}{molar mass}\)
Molar mass = 84.01g/mol
Number of moles = \(\frac{431.56}{84.01}\) = 5.14mole
write all products and relevant tests and observations when KOH reacts with NH4NO3
Answer:
get a bucket and a mop that's a wap that's wap I'm talking wobble wobble wobble that's a wap
C3H8 + 5O2 → 3CO2 + 4H2O
Cassandra calculated a percent yield of 75% for grams of water produced. The theoretical yield for water is 8.2 grams. How many grams of water did Cassandra actually produce during the lab?
a)9.0 grams
b)6.2 grams
c)8.2 grams
d)10.9 grams
Answer:
b)6.2 grams
Explanation:
Recall that percentage yield =
actual yield/theoretical yield * 100/1
theoretical yield = 8.2 grams
percentage yield = 75%
Let the actual yield be x
Hence;
75 = x/8.2 * 100
75 = 100x/8.2
75 * 8.2 = 100x
x = 75 * 8.2/100
x = 6.15 g
x = 6.2 g
75 =
how many moles of water (H2O) would be produced from the reaction of 3.25 moles of hydrochloric acid (HCL) reacting with excess calcium hydroxide (Ca(OH)2)
Answer:
3.25 moles of H2O
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2HCl + Ca(OH)2 —> CaCl2 +2H2O
Now, we can obtain the number of mole H2O produced from the reaction as follow:
From the balanced equation above,
2 moles of HCl reacted to produce 2 moles of H2O.
Therefore, 3.25 moles of HCl will also react to produce 3.25 moles of H2O.
Therefore, 3.25 moles of H2O were produced from the reaction.
2.
Si la masse volumique d'une substance est 10g/ml et sa masse est 80g, quel est
son volume??
Answer:
C
Explanation:
Is iron conducting electricity a physical, or chemical change?
Answer:
Its a chemical conducting electricity
Explain how the complexity and diversity of living things has changed over time.
Answer:A complex biological structure with many interacting parts might appear, at first glance, as if it were originally created in its present form with all its interlocking components fully formed and intact. It doesn’t seem possible that they developed step by step via biological evolution. In Darwin’s Black Box, Michael Behe introduces a term that he and other proponents of Intelligent Design use for this concept: irreducible complexity. No part of an irreducibly complex system has any apparent function except in its relation to the other parts.
Which is the correct number of moles of nitrogen monoxide that is produced from 13.2 moles of oxygen gas in the presence of excess ammonia (NH3)?
Answer:
10.56 moles of NO will be produced
Explanation:
The balanced reaction of ammonia, NH₃ with oxygen, O₂ is:
4NH₃ + 5O₂ → 4NO + 6H₂O
Where 5 moles of oxygen react with an excess of ammonia to produce 4 moles of nitrogen monoxude.
If 13.2 moles of O₂ react:
13.2 mol O₂ * (4 mol NO / 5 mol O₂) =
10.56 moles of NO will be producedWhy does the earth rotate
A:because it’s formed from cold gases collapsing due to gravity
B: Because the matter in the nebula that formed
C:Because the earth form is more than 99% of the mass of the Solar system
D; Because the hydrogen Adams inside the nebular fuse to form helium
Answer:
A
Explanation:
Your answer would be A because Earth is formed from cold gases collapsing due to gravity. The Solar System was formed when a huge amount of dust and gas began to collapse under its own gravity, and as the cloud collapse it started to spin causing the material within the cloud to gather into a swirl and then formed into planets and as the planets are formed they kept this spinning motion.
a sodium ion has a positive charge because it has
A. more electrons than protons
B. no electrons
C. the same number of electrons and
protons
D. more protons than electrons
if you dissolve 93.1g of k2CO3(s) (molar mass=136.21 g/mol) in enough water to produce a solution with a volume of 1.09 L. what is the molarity
Answer: The molarity of the K2CO3 solution is 0.625 M.
Explanation: To find the molarity of a solution, you need to know the moles of solute and the volume of the solution in liters. Here's how to solve the problem:
Calculate the moles of K2CO3 using its given mass and molar mass:
moles = mass / molar mass = 93.1 g / 136.21 g/mol = 0.682 mol
Calculate the volume of the solution in liters:
volume = 1.09 L
Calculate the molarity of the solution using the moles and volume:
molarity = moles / volume = 0.682 mol / 1.09 L = 0.625 M
HELLLLPPPPPPP
Which of the following is the correct term for the chemical reaction that forms polymers?
A. Displacement
B. Oxidation
C. Polymerization
D. Monomerization
20. What are the metals in the center of the periodic table referred to as?
The metals in the center of the periodic table are called transition metals. There are 38 transition metals in total.
Answer:
They are called transition metals.
For each of the following pairs, indicate which substance possesses the larger standard entropy.1 mol of P4(g) at 300 ∘C, 0.01 atm, or 1 mol of As4(g) at 300 ∘C, 0.01 atm1 of at 300 , 0.01 , or 1 of at 300 , 0.011 mol of P4(g) at 300 ∘C, 0.01 atm1 mol of As4(g) at 300 ∘C, 0.01 atm
The substance that possesses the larger standard entropy is 1 mol of As4(g) at 300 ∘C, 0.01 atm. As4 has a larger size and more complex structure than P4.
The standard entropy of a substance is a measure of the disorder or randomness of its particles. The higher the entropy, the more disordered the particles are. In this case, we are comparing the standard entropies of P4(g) and As4(g) at the same temperature and pressure.
Standard entropy is a measure of the randomness or disorder of a substance. Generally, larger, more complex molecules have higher standard entropy values than smaller, simpler molecules. As4 is larger and heavier than P4 due to the higher atomic weight of arsenic compared to phosphorus.
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