Friday
August 1, 2014

Homework Help: Analytical chemistry

Posted by Gloria on Saturday, September 7, 2013 at 1:54pm.

I did the next problem, i don't have the results for it and i just want to know if i calculated the mass for Fe2O3 the right?

A sample is a mixture of iron oxides (Fe2O3 and FeOOH). It's known that at 200C this reaction occurs:
2FeOOH(s)-> Fe2O3(s) + H2O(g)
A 0.2564g sample is heated and we realize that the mass of the sample reduced for 0.0097g. Calculate the mass fractions of Fe2O3 and FeOOH in the sample.

m(H2O)=0.0097g
n(H2O)=0.0097g/18(g/mol)=0.000538888 mol
n(FeOOH)=2*n(H2O)=0.001077777 mol
m(FeOOH)=n*M(88.86 g/mol)=0.095771264 g
w(FeOOH)=m(FeOOH)/0.2564g= 37.35%

m(Fe2O3)=m(sample)-m(H2O)-m(FeOOH)=0.2564g - 0.0097g - 0.095771264g= 0.150928 g
w(Fe2O3)=0.150928g/0.2564g= 58.86%

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - Where can I find the answers to these questions in my text, "...
chemistry - when writing chemical equations, for example, next to oxygen I have ...
Chemistry - Convert 355.3 kg to tons. I start the problem: 355.3 kg to 1 kg then...
chemistry - How do you make a venn diagram of the 6 branches of chemistry? (...
math,finite mathematics - this is what i have so far for the following problem ...
Math - I have 2 problems I need help with both I have narrowed it down to 2 ...
Analytical Chemistry - You prepare a solution from 10.0 mL of 0.100 M MOPS ...
Chemistry - How many carbon dioxide molecules will form when a naptha molecule ...
math,help,factoring - i need help i don't know how to do the next step. factor ...
chemistry - Many analytical instruments require liquid nitrogen. While filling ...

Search
Members