For each reaction, predict the sign and find the value of ΔS°rxn: (a) 3NO₂(g) + H₂O(l) → 2HNO₃(l) + NO(g)
Answers
The calculated value of ΔS° = -268.13 J/K
Let's think about the following equation in balance.
2 HNO3(l) + NO = 3 NO2(g) + H2O(l) (g)
The following expression can be used to determine the standard entropy change of a reaction (S°):
S° is equal to np.Sp - nr.Sr, where ni is the number of moles in reactants and products.
The usual molar entropies of the reactants and products are given by Si.
S° is equal to [2 mol S° (HNO3(l)) + 1 mol S° (NO(g))]. - [1 mol S°(H2O(l)) + 3 mol S°(NO2(g)]
[2 mol. 155.6 J/K.mol + 1 mol. 210.76 J/K] = S° .mol] - [1 mol 69.91 J/k + 3 mol 240.06 J/K.mol .mol]
ΔS° = -268.13 J/K
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Related Questions
how are hydrogen ions essential for the production of atp Hydrogen ion generation is essential for the formation of ATP because a hydrogen ion gradient is used to power ATP synthase during the final stages of cellular respiration, called oxidative phosphorylation. Oxidative phosphorylation occurs in the inner mitochondria membrane.
Answers
The production of hydrogen ions is essential for the formation of ATP, as it uses the hydrogen ion gradient to power ATP synthase in the final step of cellular respiration, called oxidative phosphorylation. Oxidative phosphorylation takes place in the inner mitochondrial membrane.
The top of the ATP synthase complex rotates as new hydrogen ions enter. Sufficient energy is present in the ATP synthase complex to synthesize ATP when three protons enter the matrix space. In this way the energy of the hydrogen ion gradient is used to generate ATP. ATP synthase uses a hydrogen ion gradient to help generate ATP, an important energy source for living organisms.
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The percent of attacks on the dark-colored mouse models is how many times greater than the percent of attacks on light-colored models
Answers
The number of times the percentage of attacks on the dark-colored mouse is greater than the percentage of attacks on light-colored mouse is four (4) times.
Let the percent of attacks on the dark-colored mouse be D.Let the percent of attacks on light-colored mouse be L.Given the following data:
Light-colored mouse models = 20 percentDark-colored mouse models = 80 percentTo determine the number of times the percentage of attacks on the dark-colored mouse is greater than the percentage of attacks on light-colored mouse.
Therefore, we would simply divide the percentage for the dark-colored mouse by the percentage for the light-colored mouse as follows:
\(Number \;of\;times = \frac{D}{L}\)
Substituting the given parameters into the formula, we have;
\(Number \;of\;times = \frac{80}{20}\)
Number of times = 4 times.
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what minimum volume of 0.282 m potassium iodide solution is required to completely precipitate all of the lead in 165.0 ml of a 0.150 m lead (ii) nitrate solution? what minimum volume of 0.282 potassium iodide solution is required to completely precipitate all of the lead in 165.0 of a 0.150 lead nitrate solution?351 ml 87.8 ml 176 ml 43.9 ml
Answers
The minimum volume of 0.282 M KI solution required to completely precipitate all of the lead in 165.0 mL of 0.150 M Pb(NO3)₂ solution is 87.8 mL.
The chemical reaction that takes place when a potassium iodide solution is added to lead (II) nitrate solution is given as follows:
Pb(NO3)₂ + 2KI → 2KNO₃ + PbI₂
From the chemical reaction, it can be seen that 2 moles of KI will react with 1 mole of Pb(NO3)₂ to yield 1 mole of PbI₂. The number of moles of lead nitrate in the given volume can be calculated as follows:
n = M × V
n = 0.150 M × 165.0 mL/1000
n = 0.02475 moles
The number of moles of KI required to precipitate all the lead can be calculated as follows:
n = 0.5 × 0.02475
n = 0.012375 moles
The volume of 0.282 M KI solution required can be calculated as follows:
V = n × M-1
V = 0.012375 moles × 0.282 L/mole
V = 0.00349 L
V = 3.49 mL
V = 87.8 mL (rounded off to three significant figures)
The answer is that 87.8 ml of 0.282 M potassium iodide solution is required to completely precipitate all of the lead in 165.0 ml of a 0.150 M lead (II) nitrate solution.
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What are 6 substances you might find in the air?
Answers
Hope this helps!
Which of the following are behavioral adaptations? Select all that apply.
A. playing dead
B. migration
C. type of teeth
D. hibernation
E. body coverings
Answers
Answer:
The 2 types of behavioral adaptation are migration, and hibernation. Explanation: Adaptation of animal is the fitness towards its environment.
Explanation:
How much H₂ is needed to react with 6.58 g of O₂ in this reaction?
H₂ + O₂ --> H₂O
Answers
For this reaction the balanced chemical equation is
2
H
2
+
O
2
→
2
H
2
O
The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.
2
m
o
l
H
2
:
1
m
o
l
O
2
:
2
m
o
l
H
2
O
The mole ratio for
O
2
H
2
O
is:
2
m
o
l
H
2
:
1
m
o
l
O
2
2
m
o
l
H
2
1
m
o
l
O
2
or
1
m
o
l
O
2
2
m
o
l
H
2
1
m
o
l
O
2
:
2
m
o
l
H
2
O
1
m
o
l
O
2
2
m
o
l
H
2
O
or
2
m
o
l
H
2
O
1
m
o
l
O
2
I hope this was helpful.
roughly how long is the entire life cycle of a star like our Sun? Explain how
you worked it out.
Answers
Answer:
Star is a cycles two
Sana maka tolong
What effect does this added energy have on the temperature, pressure, and number of collisions?
Answers
Answer: Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.
Explanation:
Magnetic substance is used to seperate
none magnetic substances.
False
True
Answers
Answer:
the answer should be true
hope this helps :)
Explanation:
Pea Plants Ck-12
The study of variation and inheritance is called
Answers
The study of variation and inheritance is called genetics. "Inheritance being defined as a technique through which the qualities and attributes are passed
What is inheritance?The term 'Inheritance' comes a contraction of the word "Inherit" that means, "to inherit any trait, attributes or traits from family". Therefore, "Inheritance being defined as a technique through which the qualities and attributes of the super class or even other derived classes are passed down to the sub or child class.
It also has the ability to take characteristics first from child class and use them in other derived classes." The study of variation and inheritance is called genetics.
Therefore, the study of variation and inheritance is called genetics.
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What is the valency of halogens?why
Answers
Answer:
-1
Explanation:
what's the relationship between weight mass and volume
Answers
The tiny particle of an atom that moves around the nucleus is the
Answers
Which is the best description of Darwin’s theory of evolution?
A.
It is the same as natural selection.
B.
It is based on the same ideas as Lamarck’s acquired characteristics.
C.
It states that all species evolve over time through natural selection.
D.
It describes DNA passed from parent to offspring as the driving force of evolution.
Answers
Answer:
d
Explanation:
stop answering people questions and not actually helping them typing random stuff like i just did here
It describes DNA passed from parent to offspring as the driving force of evolution.
What is evolution?
The basic idea of biological evolution is that populations and species of organisms change over time. Today, when we think of evolution, we are likely to link this idea with one specific person: the British naturalist Charles Darwin.In the 1850s, Darwin wrote an influential and controversial book called On the Origin of Species. In it, he proposed that species evolve (or, as he put it, undergo "descent with modification") and that all living things can trace their descent to a common ancestor.Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species and share a common ancestor. The mechanism that Darwin proposed for evolution is natural selection.
therefore option D is the correct answer.
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what is the unabbreviated electron configuration of oganesson
Answers
Answer: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6
Explanation:
If you create 1.5 liters of solution using 50.5 grams of copper (II) sulfate, what is the molarity of the solution? SHOW ALL WORK!
Answers
The solution has a molarity of 0.2108 M. (molar).
How can I determine molarity?Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in litres, is the most often used unit to represent solution concentration: litres of solution/moles of solute equals M.
We need to know how many moles of copper (II) sulphate are dissolved in the solution in order to determine the molarity of the solution.
moles = mass / molar mass
The molar mass of copper (II) sulphate is 159.609 g/mol. The finding is that the solution has the following moles of copper (II) sulphate in it:
moles = 50.5 g / 159.609 g/mol
moles = 0.3162 mol
We can now determine the molarity of the solution using the definition of molarity:
molarity = moles / volume
molarity = 0.3162 mol / 1.5 L
molarity = 0.2108 M
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An empty graduated cylinder weighs 82.450 g. When filled to 50.0 mL with an
unknown liquid it weighs 110.810 g. What is the density of the unknown liquid?
Answers
Answer:
0.567 g/mL
Explanation:
First, we will find the mass of the liquid. Subtract the weight of the empty cylinder from the weight of the filled cylinder
110.81 - 82.45 = 28.36
The mass of the liquid is 28.36 g.
Now, we find the density by dividing the mass by volume
28.36/50 = 0.5672
The density of the unknown liquid is approximately 0.5672 grams per cubic centimeter.
Given that:
Weighs of empty graduated cylinder = 82.450 g
Mass of the graduated cylinder + unknown liquid = 110.810 g
Volume of the unknown liquid = 50.0 mL
The mass of the unknown liquid can be calculated as:
Mass of unknown liquid = Mass of graduated cylinder + unknown liquid - Initial mass of graduated cylinder
Mass of unknown liquid = 110.810 g - 82.450 g
Mass of unknown liquid = 28.360 g
The density formula can be obtained as:
\(Density = \dfrac{Mass}{Volume}\)
Substitute the values in the formula:
\(Density = \dfrac{28.360 g}{50.0 mL}\)
The volume is given in milliliters (mL)
1 mL = 1 cm³,
\(Density = \dfrac{28.360 g}{50.0 cm^3 }\)
Density = 0.5672 \(\dfrac {g}{cm^3}\)
So, the density of the unknown liquid is approximately 0.5672 grams per cubic centimeter (g/cm³).
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A student performed an investigation at sea level. First she placed 400 mL of water in four different containers. Then she placed the containers on hot plates with four different temperature settings, as shown in the table. Beaker 110°C Petri Dish 95°C Erlenmeyer flask 60°C Round bottom bowl 45°C Which characteristic of water remained the same in each container?
A. the shape of the water
B. the rate of evaporation
C. The boiling point of water
D. the amount of steam released per minute
Answers
Answer:
C. The boiling point of water
Explanation:
The shape of the water and its rate of evaporation (including steam generation) will change across containers with different shapes, surface areas, and temperatures. The appropriate choice is the one shown above.
A chemist reacted 12.0 liters of F2 gas with NaCl in the laboratory to form Cl2 gas and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
Answers
Answer:
The mass of NaCl needed for the reaction is 91.61 g
We'll begin by calculating the number of mole of F₂ that reacted.
Volume (V) = 12 L
Temperature (T) = 280 K
Pressure (P) = 1.5 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
PV = nRT
1.5 × 12 = n × 0.0821 × 280
18 = n × 22.988
Divide both side by 22.988
n = 18 / 22.988
n = 0.783 mole
Next, we shall determine the mole of NaCl needed for the reaction.
F₂ + 2NaCl —> Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
Therefore,
0.783 mole F₂ will react with = 0.783 × 2 = 1.566 moles of NaCl.
Finally, we shall determine the mass of 1.566 moles of NaCl.
Mole = 1.566 moles
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl =?
Mass = mole × molar mass
Mass of NaCl = 1.566 × 58.5
Mass of NaCl = 91.61 g
Therefore, the mass of NaCl needed for the reaction is 91.61 g
Explanation:
how many neutrons of atomic mass is 31 and atomic number is 12
Answers
\(▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪\)
As we know, Number of protons = Atomic Number
So,
Number of protons = 12And, Atomic mass = Number of protons + Number of Neutrons (N)
therefore ~
31 = 12 + N N = 31 - 12 N = 19Number of Neutrons = 19
Investigate the effect of the concentration of the disodium thiosulfate solution on the rate of the process
Na2S2O3 + H2SO4 = Na2SO4 + SO2 + H2O + S.
Prepare a control sample by adding 1 cm^3 of sulfuric acid solution to 3 cm^3 of Na2S2O3 solution. Pay attention to the upcoming changes.
Pour 1 cm^3, 2 cm^3 and 3 cm^3 of Na2S2O3 solution into three test tubes respectively. Using a pipette (or syringe), add 2 cm^3 of water to the first tube, and 1 cm^3 of water to the second. Thus you get three solutions of equal volume and different concentration.
To each of the tubes successively add 1 cm^3 of sulfuric acid solution and note the time for the solution to darken from the sulfur released during the reaction. Record the results of each experiment in the table.
Graphically represent the relationship between the reaction time and the concentration of Na2S2O3 (∆t = f1(c)).
Represent the graphical dependence 1/∆t = f2(c).
Based on the graphs, draw a conclusion about the effect of concentration on the rate of the reaction.
Answers
Answer: yes but im not 100 percent sure
Explanation:
which of the following correctly shows the measurement 9.603 s rounded to three significant figures? 9.6030s 9.6s 9.60s 9.603s
Answers
Answer: I think the answer is 9.60s
Explanation: Hope it helps :)
the site where communication occurs between neurons through the release of chemicals is called the
Answers
The site where chemicals are released is called the synapse.
What is the synapse?We have to know that when we are talking about the synapse we are referring to a gap and that at this gap, the neurons, do not pass through it. rather , when the signals get to this point, they would have to pass the synapse as a chemical signal.
As such, we know that the site where communication occurs between neurons through the release of chemicals is called the synapse. This is the manner by which the chemical signals would pass the synapse.
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I need help with this question #5It is a fill-in-the-blank question and I provided the options
Answers
Answer
Based on the previous we can say that: The law of conservation of the mass states that the total mass will always stay the same during a chemical reaction. After the reaction, the vessel will have a mass equal to the initial 245 g.
Explanation
The Law of Conservation of Mass states that the mass is neither created nor destroyed in chemical reactions. This means the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Based on the previous we can say that: The law of conservation of the mass states that the total mass will always stay the same during a chemical reaction.
After the reaction, the vessel will have a mass equal to the initial 245 g.
Students were responsible for conducting 4 trials of titration of 15 mL samples of phosphoric acid (H3PO4) with volumes of a 2.2 molar strontium hydroxide (Sr(OH)2) solution. Determine the concentration of the phosphoric acid solution using the results that were obtained.
2H3PO4(aq) + 3Sr(OH)2(aq) Sr3(PO4)2(s) + 6H2O(l)
Trial 1
Trial 2
Trial 3
Trial 4
Initial Buret Reading (mL)
0.1
12.2
24.4
36.1
Final Buret Reading (mL)
12.2
24.4
36.1
48.3
Volume Base Added (mL)
Answers
The concentration of the phosphoric acid solution using the obtained results would be 1.2 M.
Stoichiometric problemFirst, we need to determine the volume of base used for each trial.
Volume of base used = final - initial burette reading
trial 1 = 12.2 - 0.1 = 12.1 mLtrial 2 = 24.2 - 12.2 = 12.0 mLtrial 3 = 36.1 - 24.4 = 11.7 mLtrial 4 = 48.3 - 36.1 = 12.2 mlTitre value = 12.1+12.0+12.2/3 = 12.1 mL
From the balanced equation of the reaction: \(2H_3PO_4(aq) + 3Sr(OH)_2(aq) -- > Sr_3(PO_4)_2(s) + 6H_2O(l)\)
The mole ratio of the phosphoric acid to the strontium hydroxide is 2:3.
Mole of 2.2 M, 12.1 mL strontium hydroxide = 2.2 x 12.1/1000
= 0.027 mol
The equivalent mole of phosphoric acid = 2/3 x 0.027
= 0.018 mol
Concentration of 15 mL, 0.018 mol phosphoric acid = 0.018/0.015
= 1.2 M
In other words, the molarity of the phosphoric acid is 1.2 M.
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7 Salt water containing 1.92 lb/gal of salt flows at a fixed rate of 2 gal/min into a 100 gal tank, initially filled with fresh water. The density of the incoming solution is 71.8 lb/ft3. The solution, kept uniform by stirring, flows out at a fixed rate of 19.2 lb/min. How many pounds of salt will there be in the tank at the end of 1 h and 40 min? What is the upper limit for the number of pounds of salt in the tank if the process continues indefinitely? How much time will elapse while the quantity of salt in the tank changes from 100 to 150 lb?
Answers
Answer:
The quantity of salt is "957 lb". A further explanation is given below.
Explanation:
(1)
As we know,
1 hour 40 Min
= 60 min + 40 min
= 100 min
Salt water is going in at the rate of 2 gal/min
Salt water went into the tank in 100 min will be:
= \(2 \ gal/min\times 100 \ min = 200 \ gal\)
We have 1.92 lb of salt per gal.
In 200 gal, salt went in 1 hour 40 min will be:
= \(1.92 \ salt/gal\times 200 \ gal\)
= \(384 \ lb\)
Now,
ft3 = 7.5 gal
The density of solution will be:
= \(\frac{71.8 \ lb}{7.5 \ gal}\)
= \(9.57 \ lb/gal\)
The solution went out in 100 min 1920 lb as well as going out at 19.2 lb per min.
= \(\frac{1920 \ lb}{9.57 \ lb/gal}\)
= \(200 \ gal\) (salt went out)
The salt remained in the tank at the end of 1 hour 40 min i.e.,
= \(384 - 200\)
= \(184 \ lb\)
(2)
As well as the upper limit for the no. of pounds for continues stirring indefinitely per 100 gal will be:
= \(957 \ lb\)
Some items, such as rubber, float on the water, while some items, such as gold, sink in
the water. If an item floats is it more or less dense than the water?
Answers
Answer:
If an item is less dense, it floats on the water.
Explanation:
We know this since the more dense something it usually is heavier than if it was less dense. Which ways it down resulting to it sinking.
what is neutralisation reaction? why is it named so? give one example.
Answers
Answer:
In chemistry, neutralization or neutralisation is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.Neutralization reactions are the reaction between acid and base. The products formed are water and salt. It is called so because the acid and base neutralize each other to form water and salt.Hint: The neutralization reaction is the one in which an acid reacts with an equimolar amount of base to give salt and water. The example could be a reaction between any strong acid and a base. The sodium chloride formed is a result of neutralization reaction.
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Why is Joe Viskocil not a fan of big explosions?
Answers
Joe Viskocil is not a fan of big explosions because it is is either lopsided or squashed and not spherical.
What is Explosion?This is defined as a sudden, violent burst of energy which is associated with a rapid expansion of volume.
Joe Viskocil doesn't like big explosions because it is is either lopsided or squashed. and capable of creating more damage.
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what is the product of the unbalanced equation blow
AL(s) + br2 (g)
Answers
Answer:
aluminium bromide
Explanation:
This is a synthesis reaction, where 2 individual molecules react to produce a single new compound.
The balanced chemical equation for the synthesis of aluminium metal and bromine gas is thus:
\(\large \textsf{$\rm 2Al_{\,(s)}+3Br_{\,2\,(g)}\rightarrow 2Al\,Br_{\,3\,(g)}$}\)
The product is therefore:
Aluminium bromide