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Question

The mass of a molecule of the compound $$C_{60}H_{122}$$ is __________.


A
1.4×1021 g
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B
1.09×1021 g
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C
5.025×1023 g
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D
16.023×1023 g
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Solution

The correct option is A $$1.4\times 10^{-21}$$ g
Molecular mass of $$C_{60}H_{122}=(60 \times 12+1 \times 122)=720+122=842$$

Hence, one mole contains $$6.022 \times 10^{23}$$ molecules 

Therefore, 

Mass of one molecule $$=\frac{842}{6.022 \times 10^{23}}$$

$$=1.4 \times 10^{-21}\;g$$

The correct option is A.


Chemistry

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