Answer:
[tex]8.74[/tex] %
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
[tex]= ( 12 * 13) + ( 1 * 18) + ( 2* 16) \\= 156 + 18 + 32\\= 206[/tex]
Percent composition of hydrogen by mass is equal to atomic mass of hydrogen divided by total mass of Ibuprofen.
[tex]\frac{18}{206} * 100\\= 8.74[/tex]
