Mole Concept

Easychemistry

A sample of methane contains 0.25 mol. How many hydrogen atoms are present?

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1.5×10⁺23

2.5×10⁺23

3.0×10⁺23

6.0×10⁺23

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

Solution

Analyse Methane ( $C H_{4}$ ): One molecule contains 4 atoms of Hydrogen.
Total Molecules:
- $N_{m o l ec u l es} = 0.25 \times 6.022 \times 1 0^{23} \approx 1.5055 \times 1 0^{23}$ .
Total Hydrogen Atoms:
- $N_{H - a t o m s} = 4 \times N_{m o l ec u l es}$
- $N_{H - a t o m s} = 4 \times (1.5055 \times 1 0^{23}) = 6.022 \times 1 0^{23}$ .
Final Result: Approx $6.0 \times 1 0^{23}$ .

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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