Mole Concept

Mediumchemistry

The number of moles of oxygen atoms in 8.8 g of CO₂ is:

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0.1

0.2

0.4

0.8

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

Solution

Correct Answer:

0.4

Find Moles of $C O_{2}$ :
- Molar mass of $C O_{2} = 12 + 2 (16) = 44 g/mol$ .
- $Moles of C O_{2} = \frac{8.8 g}{44 g/mol} = 0.2 mol$ .
Find Moles of Oxygen Atoms:
- Each molecule of $C O_{2}$ contains 2 oxygen atoms.
- Total moles of $O$ atoms $= Moles of C O_{2} \times 2$
- Total moles $= 0.2 \times 2 = 0.4 mol$ .

This medium 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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