ICSE Class 10 Chemistry 2019 Solved Paper

Calculate :

Question : 21 of 86

Marks: +1, -0

The number of moles in

12 {\g}

of oxygen gas.

[ {\O}=16]

Solution:

\;\;\text " Moles "\;=\;{\;\text " Mass in gm "\;}/{\;\text " GMM "\;}

\;\;\text " molar mass of "\; {\O}_2=16 × 2=32 {\g}

\;\; =\;{12}/{32}=0.375 \;\text " moles "\;

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