1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AleksAgata [21]
3 years ago
12

I was checking my answers for a chem test and came across a solution for a problem where the ∆S was pos, ∆H was neg and ∆G was n

eg. I believed it was only favorable at low temps, as reactions with a negative ∆H and negative ∆S are spontaneous at low temperatures. I was incorrect and the reaction was favorable at higher temps like 90 C as well.
Is a reaction always favorable if the ∆G is negative (at all temps)? What about when the ∆S is positive? If it's not favorable in all situations, what temps would cause it to be favorable? What role does ∆H play in determining the favorability of a reaction?

PLS HELP I WILL GIVE 30 POINTS AND NAME BRAINLIEST
Chemistry
1 answer:
nevsk [136]3 years ago
8 0

Answer:

there is only 15 points

Explanation:

The second law of thermodynamics says that the entropy of the universe always increases for a spontaneous process: \Delta \text {S}_{\text{universe}}=\Delta \text {S}_{\text{system}} + \Delta \text {S}_{\text{surroundings}} > 0ΔS  

universe

​

=ΔS  

system

​

+ΔS  

surroundings

​

>0delta, start text, S, end text, start subscript, start text, u, n, i, v, e, r, s, e, end text, end subscript, equals, delta, start text, S, end text, start subscript, start text, s, y, s, t, e, m, end text, end subscript, plus, delta, start text, S, end text, start subscript, start text, s, u, r, r, o, u, n, d, i, n, g, s, end text, end subscript, is greater than, 0

At constant temperature and pressure, the change in Gibbs free energy is defined as \Delta \text G = \Delta \text H - \text{T}\Delta \text SΔG=ΔH−TΔSdelta, start text, G, end text, equals, delta, start text, H, end text, minus, start text, T, end text, delta, start text, S, end text.

When \Delta \text GΔGdelta, start text, G, end text is negative, a process will proceed spontaneously and is referred to as exergonic.

The spontaneity of a process can depend on the temperature.

Spontaneous processes

In chemistry, a spontaneous processes is one that occurs without the addition of external energy. A spontaneous process may take place quickly or slowly, because spontaneity is not related to kinetics or reaction rate. A classic example is the process of carbon in the form of a diamond turning into graphite, which can be written as the following reaction:

You might be interested in
15. Calculate the hydrogen ion concentration of a
deff fn [24]

Answer:

Explanation:

pH = − log [H+] , we can solve for [H+] as,

− pH = log [H+] ,

[H+] = 10^−pH,

so PH =2.4 in you case is

[H+] = 10^-2.4 =0.00398

The option are not correct it looks

4 0
3 years ago
What is the concentration of the base (NaOH) in this titration?
dalvyx [7]

The answer is B for fact

8 0
3 years ago
Read 2 more answers
Calculate the number of atoms in 112 g of iron.​
mr_godi [17]

Answer:

1 mole of iron (Fe) = 56 g (molar mass)

Since 56 g of iron = 1 mol.

Therefore, 112 g of iron= 1/ 56 ×112 mol = 2 mol.

Explanation:

8 0
3 years ago
The density of atmosphere (measured in kilograms/meter3) on a certain planet is found to decrease as altitude increases (as meas
Paha777 [63]
The density at 1,291 km from the surface of the planet is

              [ (1,291 - planet's radius)/(planet's radius) ] ^ some power .
7 0
3 years ago
How many molecules of zinc oxide are there in a 2 kg sample?
Novosadov [1.4K]

There are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample. Details about number of molecules can be found below.

<h3>How to calculate number of molecules?</h3>

The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

According to this question, there are 2000g of ZnO in a sample. Zinc oxide has a molar mass of 81.38 g/mol.

no of moles = 2000g ÷ 81.38g/mol

no of moles = 24.57mol

number of molecules = 24.57 × 6.02 × 10²³

number of molecules = 147.95 × 10²³

Therefore, there are 1.48 × 10²⁵ molecules of zinc oxide in a 2 kg sample.

Learn more about number of molecules at: brainly.com/question/11815186

#SPJ1

6 0
2 years ago
Other questions:
  • Kepler was able to determine that the planets move slowest when they are _____.
    9·2 answers
  • Select all of the following that are particles of atoms. protons neutrons electrons quarks Atoms are composed of particles calle
    13·2 answers
  • How many grams of water can be cooled from 33 ∘c to 15 ∘c by the evaporation of 50 g of water? (the heat of vaporization of wate
    8·1 answer
  • Which of these is an element?<br> A)air <br> B)Carbon dioxide(CO2)<br> C)water(H20)<br> D)carbon(c)
    15·1 answer
  • What type of element looes electrons easily
    6·1 answer
  • Using the combined gas law, calculate the following. Also, what other law could you have used to solve this problem?
    7·1 answer
  • N2O4(g) 2NO2(g) Which of the following represents the Keq value? 0.18 0.0067 0.131 0.0046
    12·1 answer
  • What's the relation between Kp and Kc​
    10·1 answer
  • A closed gas system initially has pressure and volume of 0.922 atm and 4.64L with the temperature unknown. If the same closed sy
    15·1 answer
  • Please help me!<br> Physical change involves a change in composition.<br><br><br> True or False
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!