Atoms and Molecules · Class 9 · CBSE Science

What is the mass of 0.5 mole of nitrogen gas (N2)?

Practice question from Atoms and Molecules (Class 9 · CBSE Science), with the correct answer and a step-by-step solution.

medium · MCQ · Q-2D7E10

What is the mass of 0.5 mole of nitrogen gas ( $N_2$ )?

A.7 g
B.14 gCorrect answer
C.28 g
D.56 g

Solution

The molar mass of nitrogen gas ( $N_2$ ) is $2 \times 14 = 28\text{ g/mol}$ . Mass = number of moles $\times$ molar mass = $0.5\text{ mol} \times 28\text{ g/mol} = 14\text{ g}$ .

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