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7.0 g of a gas at 300 K and 1 atm occupi...

7.0 g of a gas at 300 K and 1 atm occupies a volume of 4.1 litre. What is the molecular mass of the gas?

A

42

B

38.24

C

14.5

D

46.5

Text Solution

Verified by Experts

The correct Answer is:
A
Applying , `PV =(m)/(M) RT`
`P= 1 atm , V= 4.1 L, m = 7.0 g ,`
` R = 0.0821 L " atm " K^(-1) " mol"^(-1) , T = 300 K`
` M = (RT)/(PV) xx m = (0.0821 xx 300)/( 1 xx 4.1 ) xx 7.0 = 42.05 ~~ 42 u`
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