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Some Basic Concepts Of Chemistry

Question
CBSEENCH11004926

The vapour density of a gas A is four times that of B. If the molecular mass of B is M what is the molecular mass of A?

Solution

According to the relationship:
Mass=2 x Vapour density
we have give mass of B is M, thus Vapour density of B is,
V.D.=straight M over 2
also, given A is four times that of B, then
therefore space space space space straight V. straight D. space space of space space straight A space equals space 4 space cross times space straight V. straight D. space of space straight B space equals space 4 space cross times space straight M over 2 space equals space 2 straight M
therefore space space space space Molecular space mass space of space straight A space equals space 2 space straight X space 2 straight M space equals space 4 straight M right square bracket