Question

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

Answer 1

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_9H_8O_4 = 180.15 g/[mol]`

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

`% H = 4.48%`