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Dalton's Law of Partial Pressures

The molecular...

Question

The molecular weight of a gas is 40. At 400K, if 120g of this gas has a volume of 20 litres, the pressure of the gas is?

A

5.02 atm

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B

0.546 atm

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C

4.92 atm

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D

49.6 atm

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Solution

The correct option is C 4.92 atm
Moles of gas $= \frac{120}{40} = 3 = n$
$∵ P V = n R T$
$∴ P \times 20 = 3 \times 0.0821 \times 400$
$P = 4.926$ atm.

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