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ICSE Class 10 Chemistry 2017 Solved Paper

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A gas cylinder can hold 1‌kg of hydrogen at room temperature and pressure :
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Question : 62
Total: 86
Find the number of moles of hydrogen present.
Solution:  
No of moles of hydrogen
‌=‌
‌ wt.of hydrogen in gms ‌
‌ gm mol.mass ‌

‌=‌
1000
2
=500‌ moles. ‌
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