Question

A 78.0 g sample of an unknown compound contains 12.4 g of hydrogen. What is the percent by mass of hydrogen in the compound?

• A. 25%
• B. 35%
• C. 16%
• D. 50%

Answer 1

The correct option is C 16%

% of $H$$=$$\frac{12.4}{78}\times 100$$=16$%