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Law of Constant Proportions

A 78.0 g samp...

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%

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B

35%

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C

16%

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D

50%

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Solution

The correct option is C 16%
% of $H$ $=$ $\frac{12.4}{78} \times 100$ $= 16$ %

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