Homework Help: Chemistry

Posted by asdfjkl; on Thursday, February 19, 2009 at 11:58pm.

Determine the percent composition by mass of ammonia sulfate.

Chemistry - drwls, Friday, February 20, 2009 at 12:09am
I believe you mean ammoniUM sulfate.

The formula is (NH4)2 SO4,
so it has 2 N's, 8 H's, 1 S and 4 O atoms.

Calulate the molar mass (28 + 8 + 32 + 64) and compute the mass percentages of each element.
Chemistry - Chopsticks, Friday, February 20, 2009 at 12:11am
I think ammonia sulfate is (NH3)2SO4
What you need to do first is find out what the molar mass is for all of those elements combined.

2N=2*14.00
6H=6*1.008
S=32.065
4O=4*15.999

add those up and get the molar mass then to find the %of each element in the compound

(Total mass of element/total MM) * 100%
Chemistry - Chopsticks, Friday, February 20, 2009 at 12:13am
Oh sorry, drwls is right. I got my compound wrong. There should be 8 H
Chemistry - asdfjkl;, Friday, February 20, 2009 at 12:17am
thank you both.

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