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Q.

What is the molar mass of a gas if $10.0$ grams of it occupy $4.48$ litres at $273 K$ and $101.3 k Pa (1.00$ atm)?

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a

$2.00 g / mol$

b

$50.0 g / mol$

c

$100 g / mol$

d

$25.0 g / mol$

answer is B.

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Detailed Solution

As we know, the number of moles is,

n=W/M

From ideal gas equation,
$P V = \frac{W}{M} R T$

$\Rightarrow M = 50$

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