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Stoichiometric Calculations

What is the m...

Question

What is the molecular weight of a gas that has a density of $3.75 g / L$ at standard temperature and pressure?

26.15 g / m o l

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84 g / m o l

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3.75 g / m o l

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5.97 g / m o l

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Solution

The correct option is C $84 g / m o l$
$1 M o l e$ of gas occupy $22.4 L i t r e s$ of volume at STP.
Given, $1 L i t r e$ of gas $= 3.75 g$ of gas
So, $22.4 L i t r e s$ of gas $= 22.4 \times 3.75 = 84 g$ of gas
So, $22.4 L i t r e s$ of gas weighs $84 g r a m s$ which is molar mass of gas.

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