For 10 gms of helium, the product of pressure and volume is equal to ________ times the product of a gas constant and absolute temperature.

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1.25

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2.5

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Solution

The correct option is C 2.5
$P V = n R T$
$n = \frac{w e i g h t}{m o l e c u l a r w e i g h t}$
$n = 10 / 4$
$n = 2.5$ (Number of moles of helium)
So now, $P V / R T = n = 2.5$

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