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  4. How many moles of oxygen are contained in one litre of air if its volume content is 21 % in standard conditions?

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Q. How many moles of oxygen are contained in one litre of air if its volume content is $21 \%$ in standard conditions?

Some Basic Concepts of Chemistry

Solution:

Oxygen content in $1\, L$ at $STP =\frac{1 \times 21}{100}=0.21\, L$
$22.4\, L$ at $STP =1 \,mol$
hence $0.21 \,L$ at $STP =\frac{1 \times 0.21}{22.4}=0.009375\, mol$