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ICSE Class 10 Chemistry 2019 Solved Paper

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Question : 21
Total: 86
The number of moles in 12g of oxygen gas. [O=16]
Solution:  
‌‌ Moles ‌=‌
‌ Mass in gm ‌
‌ GMM ‌

‌‌ molar mass of ‌O2=16×2=32g
‌‌=‌
12
32
=0.375‌ moles ‌
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