Question

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Answer 1

Answer:

22.1 u is your answer

Explanation:

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Answer 2

Answer:

$\sf \: average \: atomic \: mass = m_{av} \: = \: to \: find \\ \\ \sf \: m_{av} = 21 \times \frac{30}{100} + 23 \times \frac{70}{100} \\ \\ = \frac{21 \times 30 + 23 \times 70}{100} \\ \\ = \frac{2240}{100} \\ \\ = 22.4$