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  4. The number of molecules present in 1 dm 3 of hydrogen at S.T.P. is

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Q. The number of molecules present in $1\, dm ^{3}$ of hydrogen at S.T.P. is

Some Basic Concepts of Chemistry

Solution:

We know that $1$ mole of $H _{2}$ at S.T.P. occupies $22.4 \,dm ^{3}$ and contains $6.023 \times 10^{23}$ molecules. Therefore $1 \,dm ^{3}$ of hydrogen contains $\frac{6.023 \times 10^{23}}{22.4}=2.69 \times 10^{22}$ molecules.