Mole Concept

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How many molecules are present in 5.6 g of nitrogen gas (N₂)?

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1.2 × 10²³

6.02 × 10²³

3.01 × 10²³

1.505 × 10²³

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Subject: chemistry
Chapter: some basic concepts in chemistry
Topic: mole concept
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

1.2 × 10²³

To find the number of molecules:

Calculate Moles ( $n$ ):
- Molar mass of $N_{2} = 2 \times 14 = 28 g/mol$ .
- Moles of $N_{2} = \frac{mass}{molar mass} = \frac{5.6}{28} = 0.2 mol$ .
Calculate Molecules:
- Number of molecules $= n \times N_{A}$ (Avogadro's Number).
- Molecules $= 0.2 \times 6.022 \times 1 0^{23} \approx 1.2 \times 1 0^{23}$ .

This easy difficulty chemistry question is from the chapter some basic concepts in chemistry, covering the topic of mole concept. It appeared in the 2025 exam.

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