Question

# 0.2 mole of an alkane on complete combustion gave 26.4g of carbon dioxide. Find the molecular weight of alkane :

A
16
B
30
C
44
D
58

Solution

## The correct option is C $$44$$$$O.2$$ mole of alkane gives 26.4 g of $$CO_2$$Hence, 1 mole gives $$\frac {26.4}{O.2} \, g$$ of $$CO_2$$$$= 132 \, g$$ of $$CO_2$$1 mole of $$CO_2$$ is 44 gm132 of $$CO_2$$ means 3 moles $$\therefore$$ Alkane has 3 carbon atom and therefore, it is providing $$3 \,CO_2$$Formula is $$C_3H_8$$ (propane)Molecular weight of $$C_3H_8$$ is 44.Hence the correct option is C.Chemistry

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