What is the percentage by mass of H in
What is the percentage by mass of H in CH3COOH
1.7%
5.0%
6.7%
7.1%
Correct answer is C
- molecular mass (or molar mass) is 60.05 g/mol
- with 4 atoms of hydrogen present
( 4 / 60 ) X 100
≈6.7%
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