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380 mL of a gas at 27^(@) C , 800 mm of ...

380 mL of a gas at `27^(@) C` , 800 mm of Hg weights 0.455 g . The mol., wt. of gas is :

A

27

B

28

C

29

D

30

Text Solution

Verified by Experts

The correct Answer is:
B
From `P v = (w)/(M) RT = (800)/(760) xx (380)/(1000) = (0.455)/(M) xx 0.0821 xx 300`
`M = (0.455 xx 0.00821 xx 300 xx 5)/(2) = 28.016`
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