Chemistry Question

Question

I have some questions about the below:

Given the The Compound C6H10N4O2, calculate percent composition using the atomic masses: Hydrogen = 1.008, Carbon = 12.011, Oxygen = 15.999, and Nitrogen = 14.007. Use significant figures when showing percent composition.

Is there a formula to do the above? How do I figure out these types of questions? Is there a tutorial available?

Thank you

Answer 1

The formula is mass of each element divided by total times 100 percent. Ill do the first 2 and you should be able to do the rest.

Total mass :

6 C = 6 x 12.011 = 72.066 g

10 H = 10 x 1.008 = 10.08 g

4 N = 4 x 14.007 = 56.028 g

2 O x 15.999 = 31.998 g

Total mass = 170.172 g

% C = 72.066 g/ 170.172 g(x100%) = 42.35%

% H = 10.08 / 170.172 (x100%) = 5.923%