Mole Concept

Find Number of Moles:
- $n = \frac{N u mb er o f a t o m s}{N _{A}} = \frac{3.011 \times 1 0 ^{23}}{6.022 \times 1 0 ^{23}} = 0.5 m o l$ .
Calculate Molar Mass:
- $M o l a r ma ss = \frac{M a ss}{M o l es} = \frac{12 g}{0.5 m o l} = 24 g / m o l$ .
Identify the Element:
- Magnesium ( $M g$ ) has a molar mass of $24 g / m o l$ .
- (Carbon is 12, Aluminium is 27, Oxygen is 16).

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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