Hydrofluoric acid contains what percent hydrogen by mass?

1.0

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5.0

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10

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15

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20

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Solution

The correct option is B $5.0$ %
The atomic masses of H and F are 1 g/mol and 19 g/mol respectively.
Mass percent of hydrogen in hydrofluoric acid (HF)
$= \frac{atomic mass of hydrogen}{atomic mass of hydrogen + atomic mass of fluorine} \times 100$
$= \frac{1}{1 + 19} \times 100 = 5 %$

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Hydrofluoric acid contains what percent hydrogen by mass?

The correct option is B 5.0%The atomic masses of H and F are 1 g/mol and 19 g/mol respectively.Mass percent of hydrogen in hydrofluoric acid (HF) = atomic mass of hydrogen atomic mass of hydrogen+ atomic mass of fluorine×100= 11 +19×100=5%

The correct option is B $5.0$ %
The atomic masses of H and F are 1 g/mol and 19 g/mol respectively.
Mass percent of hydrogen in hydrofluoric acid (HF)
$= \frac{atomic mass of hydrogen}{atomic mass of hydrogen + atomic mass of fluorine} \times 100$
$= \frac{1}{1 + 19} \times 100 = 5 %$