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Solution :

Volume of one hydrogen atom `=4//3 pi r^(3)` (volume of sphere) <br> `=4//3xx3.14xx(0.5xx10^(-10))m^(3)=5.23xx10^(-31) m^(3)` <br> According to Avagardo's hypothesis, one mole of hydrogen contains `6.023xx10^(23)` atoms. <br> Atomis volume of 1 mole of hydrogen atoms <br> `=6.023xx1023xx5.23xx10^(-31)=3.15xx10^(-7) m^(3)`.