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Q.

A compound has 40% of carbon by weight. If the molecular weight of the compound is 90, the numbers of  carbon atoms present in 1 molecule of  the compound are
 

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a

2

b

1

c

3

d

5

answer is A.

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Detailed Solution

Weight of carbon present in 1 mole of compound = 40 × 90 / 100 = 36g
 No of gram atoms of carbon = 36 / 12  = 3

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