The sign of ΔHrxn and ΔSrxn for several different reactions are given.

1 answer:

6 0

The answer is ΔSrxn>0 and ΔHrxn<0

This is because of the thermodynamic equation of the Gibbs Free Energy given by:

ΔG = ΔH – TΔS

First, it is important to note that spontaneous reactions are usually given by ΔG <0, ΔH<0 and ΔS>0. However, ΔG is the most important identifier of a thermodynamic process, so it is best to figure out the conditions that would give a negative ΔG.

For the equation's first term (ΔH), ΔG decreases when ΔH is decreased. For the second term TΔS, it can be observed that ΔG decreases when TΔS is increased due to the negative or minus sign.

So for all temperatures, ΔG is kept negative if ΔH is negative and TΔS is positive (because of the negative sign).

You might be interested in

An electron in the n=6 level of the hydrogen atom relaxes to a lower energy level, emitting light of ?=93.8nm. find the principa

Rama09 [41]

We can find the principal level or lower level using Rydberg's formula:

1/w = R(1/L² - 1/U²)

where:

w is the wavelength (93.8 nm),

L is the lower energy level (unknown)

U the upper energy level (n= 6)

R is Rydberg's constant (10,967,758 waves per meter)

Substituing known values into the equation:
1/(9.38 * 10^-8 m.) = 10,967,758(1/L² - 1-36)

Using the solver function of the calculator to get for L:

L = 0.999 
so L = 1.
The lower level is 1 (the ground state).

3 0

3 years ago

Read 2 more answers

1.which electromagnetic wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy ?

Sergeu [11.5K]

Radio waves infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation. Radio waves have the longest wavelength, and gamma rays have the shortest wavelength.

8 0

3 years ago

What tool(s) do scientists use to determine what stars are made of? What might be a more effective way to determine their compos

Gekata [30.6K]

spectroscopy,
Some spectrometers work on things other than light. For example, a mass spectrometer takes a mixture of chemicals and separates them according to their weight. Other spectrometers measure invisible forms lof light like infrared or x-rays. The idea is always the same, though.
Hope this helped!

7 0

4 years ago

Which pair of elements is most likely to form an ionic compound with each other?

mixer [17]

Barium and chlorine

3 0

3 years ago

Calculate the percent ionization of nitrous acid in a solution that is 0.230 M in nitrous acid. The acid dissociation constant o

djyliett [7]

Ok first, we have to create a balanced equation for the dissolution of nitrous acid.

HNO2 <-> H(+) + NO2(-)

Next, create an ICE table

HNO2 <--> H+ NO2-
[]i 0.230M 0M 0M
Δ[] -x +x +x
[]f 0.230-x x x

Then, using the concentration equation, you get

4.5x10^-4 = [H+][NO2-]/[HNO2]

4.5x10^-4 = x*x / .230 - x

However, because the Ka value for nitrous acid is lower than 10^-3, we can assume the amount it dissociates is negligable,

assume 0.230-x ≈ 0.230

4.5x10^-4 = x^2/0.230

Then, we solve for x by first multiplying both sides by 0.230 and then taking the square root of both sides.

We get the final concentrations of [H+] and [NO2-] to be x, which equals 0.01M.

Then to find percent dissociation, you do final concentration/initial concentration.

0.01M/0.230M = .0434 or

≈4.34% dissociation.

8 0

3 years ago