# \What is the percent by mass of hydrogen in aspirin, C_9H_8O_4?

Jan 18, 2016

4.48%

#### Explanation:

To get the percent by mass of Hydrogen in a compound like aspirin, all you have to do is divide the mass of hydrogen by the molecular mass of aspirin then multiply it to 100%.

Solution:

${C}_{9} {H}_{8} {O}_{4} = 180.15 \frac{g}{m o l}$

% H = (((8) (1.00794 g/[mol])) /[ 180.15 g/[mol]])*100%

% H = 4.48%