4. (a) A lab analysis of a 10.00 g sample of benzene indicates that it contains 9.20 g of carbon.

Question

What is the mass of hydrogen in the sample? Explain. (b) What is the percentage composition of benzene?

Answer 1

Since benzene is only made up of carbon and hydrogen fairly easy question 9.20/10.00= .920 x100 = 92.0 %C, so 0.800g H & 8.00% H

Answer 2

Benzene only contains carbon (C) and hydrogen (H)

Mass of sample = 10.00 g

Mass of C = 9.20 g

Mass of H = 10.00 g - 9.20 g = 0.80 g

% composition:

9.20 g C/10.00 g (x100%) = 92.0 % carbon

0.80 g H/10.00g (x100%) = 8.00% hydrogen