Question

# $$116$$ mg of a compound on vaporization in a Victor Meyers apparatus displaces $$44.8$$ mL of air measured at STP. What is the molecular mass of the compound?

A
46 g
B
50 g
C
54 g
D
58 g

Solution

## The correct option is D $$58$$ ggiven, 116 mg of a compound vaporization in victor meyer's apparatus displaces 44.8 ml of air of air measured at stp.given volume = 44.8mlso, number of mole of compound = given Volume/22400 ml= $$\dfrac{44.8ml}{22400ml}$$= $$\dfrac{2}{1000}$$ = 0.002 we know, no of moles of compound = given weight/molecular weight of compoundso, 0.002 = 116mg/molecular weight of compoundis, molecular weight of compound = $$\dfrac {116 \times 10^{-3}} {0.002}$$ = 58g/mol ChemistryNCERTStandard XII

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