JEE MAIN - Chemistry (2017 (Offline) - No. 13)
The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon
(22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all
1H atoms are replaced by 2H atoms is:
37.5 kg
7.5 kg
10 kg
15 kg
Explanation
Given that weight of human adult is = 75 kg
Among those 75 kg, 10% is Hydrogen(1H).
$$\therefore$$ Mass of 1H = $$75 \times {{10} \over {100}}$$ = 7.5 kg
Now when every 1H atom is replaced by 2H atom then weight of every atom is become double. So total weight of 2H becomes = 2$$ \times $$7.5 = 15 kg.
So the weight gain by the person = 15 - 7.5 = 7.5 kg
Among those 75 kg, 10% is Hydrogen(1H).
$$\therefore$$ Mass of 1H = $$75 \times {{10} \over {100}}$$ = 7.5 kg
Now when every 1H atom is replaced by 2H atom then weight of every atom is become double. So total weight of 2H becomes = 2$$ \times $$7.5 = 15 kg.
So the weight gain by the person = 15 - 7.5 = 7.5 kg
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