(JEE Main 2017) The most abundant elements by mass in the human body are Oxygen (61.4%), Carbon (22. — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
(JEE Main 2017) The most abundant elements by mass in the human body 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 $^{1}H$ atoms are replaced by $^{2}H$ atoms is:
Answer: C
💡 Solution & Explanation
Mass of Hydrogen $= 75 \times 0.1 = 7.5 \text{ kg}$. <br>Atomic mass doubles ($^{1}H \rightarrow ^{2}H$). <br>The mass of hydrogen will increase by another 7.5 kg. <br>Total weight gain $= 7.5 \text{ kg}$. [1, 2]
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