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Find the mass of 0.3 mole of aluminium. (Atomic mass of Al = 27)
A5.4 g
B9.0 g
C27.0 g
D8.1 g
Answer & Solution
Correct answer: D. 8.1 g
1. Mass $= \text{number of moles} \times \text{atomic mass}$.
2. $= 0.3 \times 27$.
3. $= 8.1$ g of aluminium.
Dividing 27 by 0.3 would give 90, but here we multiply.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 7 Atoms and Molecules "Solved Problems", p.106_
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