Homework Help: Chemistry

Posted by Kelsey on Thursday, March 15, 2012 at 12:18am.

Consider the decomposition of a metal oxide to its elements, where M represents a generic metal.

M203(s)---> 2M(s) + 3/2 O2(g)

info given for Gf(kJ/mol):
M203= -10.60
M(s)=0
O2(g)= 0

1.) what is the standard change in Gibbs energy for rxn as written in forward direction? (kJ/mol)

2.) What is the equilibrium constant (K) of this rxn, as written in forward direction at 298K?

3.) What is the equilibrium pressure of O2(g) over M(s) at 298K? (atm)

For 1.) I got 10.6 kJ/mol and this is correct
For 2.) I got K= -4.28 and it marked me wrong. Now I got an answer of .01387. Is this correct???
For 3.) I got PO2= 0.0016 atm and it marked me wrong......I don't know how it is wrong.

Could you please check #2 and #3 and tell me what I did wrong and what are the answers thanks.

Chemistry - DrBob222, Thursday, March 15, 2012 at 12:50am
I agree with your answer to #2.
For #3, if we do
0.01378 = pO2^3/2
and I evaluate that as 0.05748 atm but that has too many s.f. and I would round to 0.0575 atm. I tried 0.05748^1.5 and that = 0.01378. Check that carefully.
Chemistry - Kelsey, Thursday, March 15, 2012 at 12:56am
Yes it is correct! Thanks! :) I see my mistake!

Answer this Question

Related Questions

Chemistry - Consider the decomposition of a metal oxide to its elements, where M...
Chemistry - In an experiment 1.015 g of a metal carbonate, containing an unknown...
chemistry - when aluminum metal reacts with iron (III) oxide to form aluminum ...
Chemistry - I need help classifying these as physical and chemical properties! 1...
Chemistry - When 1.187g of a metallic oxide is reduced with excess hydrogen, 1....
chemistry - All of the lanthanide metals react with HCl to form compounds having...
Chemistry - Bauxite ore contains aluminum oxide Al2O3(s) which is decomposed ...
chem - A metal oxide reacts with water to produce a metal hydroxide. What ...
Chemistry - If 200 g. of an unknown metal oxide, M2O3, upon reaction with ...
Chemistry - Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic ...

For Further Reading

First Name:
School Subject:
Answer: