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ICSE Class 10 Chemistry 2019 Paper

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Question : 21 of 86
Marks: +1, -0
The number of moles in 12g12 \mathrm{g} of oxygen gas. [O=16][\mathrm{O}=16]
Solution:  
Moles=Mass in gmGMM\text{Moles} = \frac{\text{Mass in gm}}{\text{GMM}}
molar mass of O2=16×2=32g\text{molar mass of } \mathrm{O}_2 = 16 \times 2 = 32 \mathrm{g}
=1232=0.375 moles= \frac{12}{32} = 0.375 \text{ moles}
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