If $V \ mL$ of the vapours of a substance at $NTP$ weigh $W \ g$,find the molecular weight of the substance.
- A$\frac{W}{V} \times 22400$
- B$\frac{V}{W} \times 22400$
- C$(W - V) \times 22400$
- D$\frac{W}{V \times 224}$
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