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 $H^{1}$ atoms are replaced by $H^{2}$ is :

 JEE MAIN 2017

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Solution

Mass of hydrogen in adult human = $(10 / 100) \times 75 = 7.5 k g$
Replacing $H^{1}$ by $H^{2}$ would replace 7.5 kg with 15 kg.
$∴$ Net gain = $7.5 k g$

Hence the correct option is (a).

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Similar questions

Q. 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

H^{1}

atoms are replaced by

H^{2}

atoms is:

Q. 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

H^{1}

atoms are replaced by

H^{2}

is :

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_______.

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Mass of hydrogen in adult human = (10/100)×75=7.5 kg Replacing H1 by H2 would replace 7.5 kg with 15 kg. ∴ Net gain = 7.5 kg Hence the correct option is (a).

Mass of hydrogen in adult human = $(10 / 100) \times 75 = 7.5 k g$
Replacing $H^{1}$ by $H^{2}$ would replace 7.5 kg with 15 kg.
$∴$ Net gain = $7.5 k g$

Hence the correct option is (a).