What weight of ammonia contains the same number of molecules as 11.2 liters of oxygen at STP?
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What weight of ammonia contains the same number of molecules as 11.2 liters of oxygen at STP?

What weight of ammonia contains the same number of molecules as 11.2 liters of oxygen at STP?
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What weight of ammonia contains the same number of molecules as 11.2 liters of oxygen at STP?

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SOLUTION : Since, $11 \cdot 2$ litres of $O_{2}$ gas contain half mole.

i.e., $N_{A} / 2$ molccules, hence half mole of $NH _{3}$ will weight

$=\frac{ mol \text {. wt. }}{2}=\frac{17}{2} g =8 \cdot 5 g$

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