Q.

The weight of a molecule of the compound C60H122 is

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a

1.4  ×  10−21 g

b

1.09  ×  10−21 g

c

5.025  ×  1023 g

d

16.023  ×  1023 g

answer is A.

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Detailed Solution

Molecular  weight  of  C60H122=12 ×  60+122×1                                       =720+122=842∵   6   ×  1023  molecules of C60H122  has  mass  =  842 g∴  1  molecule of  C60H122 has  mass 8426 ×  1023                                           =140.333  ×  10−23 g                                            =1.4  ×  10−21 g.
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