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ICSE Class 10 Chemistry 2017 Paper

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A gas cylinder can hold 1 kg1\ \mathrm{kg} of hydrogen at room temperature and pressure :
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Question : 62 of 86
Marks: +1, -0
Find the number of moles of hydrogen present.
Solution:  
No of moles of hydrogen
=wt.of hydrogen in gmsgm mol.mass=\frac{\text{wt.of hydrogen in gms}}{\text{gm mol.mass}}
=10002=500  moles.=\frac{1000}{2}=500\;\text{moles.}
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