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Nitrogen

What is the m...

Question

What is the mass in grams of 3 moles of nitrogen gas?

42 g

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21 g

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28 g

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84 g

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Solution

The correct option is C 84 g
Molecular weight of $N_{2} = 28 g$
$∴$ $1$ mole of $N_{2}$ weighs $28 g m$
$∴$ $3$ moles of $N_{2}$ weighs $= 3 \times 28 g = 84 g$

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