ICSE Class 10 Chemistry 2014 Solved Paper

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A cylinder contains 68g of ammonia gas at s.t.p.
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Question : 73
Total: 88
How many moles of ammonia are present in the cylinder?
Solution:  
No. of moles =‌
‌ Mass in gm ‌
‌ Gram molecular mass ‌

‌=‌
68
17
=4‌ moles. ‌
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