Question

Ibuprofen is a common pain reliever and anti-inflammatory. Its formula is below. Determine the percent composition of hydrogen by mass. *

Answer 1

`8.74` %

Step-by-step explanation:

Please see the complete question in the attachment

The given formula of Ibuprofen consists of 13 atoms of carbon, 18 atoms of hydrogen and 2 atoms of oxygen.

The atomic mass of carbon, hydrogen and oxygen is 12, 1 and 16 respectively.

The total atomic mass of Ibuprofen is equal to

`= ( 12 * 13) + ( 1 * 18) + ( 2* 16) \\= 156 + 18 + 32\\= 206`

Percent composition of hydrogen by mass is equal to atomic mass of hydrogen divided by total mass of Ibuprofen.

`(18)/(206) * 100\\= 8.74`