Question

Example 1.3: The mass of a hydrogen molecule is 3.34 x 10-27 kg. Find the number of hydrogen molecules in 1 g of hydrogen gas.


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Answer 1

Mass of one molecule of

$H_2=3.34×10 {}^{ - 27}$

Molecular mass of hydrogen

$=2×10 {}^{ - 3}$

The Avogadro's number

$N_A$

, which is the number of molecules in one gram molecule of hydrogen is given by

$N_A = \frac{2 \times {10}^{ - 3} }{3.34 \times 10 {}^{ - 27} } = 5.988 \times {10}^{23}$

molecules.