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A78.0-g sample of an unknown compound contains 12.4 g of hydrogen. What is the percent by mass of hydrogen in the compound?

1 Answer

Sep 14, 2016

$%hydrogen$ $"%hydrogen"$ $=$ $=$ $\frac{12.4 \cdot g}{78.0 \cdot g} \times 100 %$ $(12.4*g)/(78.0*g)xx100%$ $≅ 15 %$ $~=15%$

Explanation:

So all we have done is take the quotient:

$\frac{Mass of hydrogen}{Mass of stuff} \times 100 %$ $"Mass of hydrogen"/"Mass of stuff"xx100%$

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