In the body of a healthy adult human, the most prevalent elements by mass are Oxygen $(O)$ $(61.4 %)$ , Carbon $(C)$ $(22.9 %)$ , Hydrogen $(H)$ $(10 %)$ , and Nitrogen $(N)$ $(2.6 %)$ . If all ${}^{1}H$ atoms are switched out for ${}^{2}H$ atoms, a $75 kg$ human will acquire the following amount of weight:

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Solution

Given:
An abundance of elements by mass
Oxygen $(O)$ . $= (61.4 %)$
Carbon $(C)$ $= (22.9 %)$
Hydrogen $(H)$ $= (10 %)$
Nitrogen $(N)$ $= (2.6 %)$
Total weight of the person = $75 kg$
$\begin{array}{rcl} Mass due to {}^{1}H & = & \frac{75 \times 10}{100} \\ = & 7.5 kg \end{array}$
${}^{1}H$ atoms are switched out for ${}^{2}H$ atoms,
$Mass due to {}^{2}H = (7.5 \times 2) kg$
So, mass gain by a person $= 7.5 kg$
Final answer: hence the total mass gain by a person is $7.5 kg$ .

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In the body of a healthy adult human, the most prevalent elements by mass are Oxygen (O) (61.4%), Carbon (C)(22.9%), Hydrogen (H) (10%), and Nitrogen (N) (2.6%). If all H1 atoms are switched out for H2 atoms, a 75kg human will acquire the following amount of weight: