posted by asdfjkl; .
Determine the percent composition by mass of ammonia sulfate.
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.
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.
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%
Oh sorry, drwls is right. I got my compound wrong. There should be 8 H
thank you both.