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Question

Calculate: 
The weight of $$10^{22}$$ atoms of carbon.
[$$C = 12$$, Avogadro’s No. $$= 6 \times 10^{23}$$]


Solution

$$6.022 \times 10^{23}$$ atoms of carbon weigh $$\to 12 g$$
1 atom of carbon weighs $$\to \dfrac{12}{6 \times 10^{23}}$$
$$10^{22}$$ atoms of carbon will weigh $$\to \dfrac{12}{6 \times 10^{23}} \times 10^{22}=\dfrac{12}{60}=\dfrac{1}{5} = 0.2 g$$

Chemistry

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