How many grams are there in $5 m o l e s$ of oxygen ?

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Solution

Number of moles of oxygen given( $n$ ) $= 5 m o l e$
$1 m o l e$ of oxygen $= 16 g$
Molecular weight of oxygen molecule $(M)$ $= 32 g / m o l e$
Weight of oxygen in gram $= n \times M$
substitute the value of n and M $= 5 m o l \times 32 g m o l^{- 1}$
$= 160 g$
∴ $160 g$ of oxygen is present in $5 m o l e s$ of oxygen

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