JEE Main Solved Paper 2017 Question 7
Question: 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 $ {{,}^{2}}H $ atoms is [JEE Main Solved Paper-2017]
Options:
A) 15 kg
B) 37.5 kg
C) 7.5 kg
D) 10 kg
Show Answer
Answer:
Correct Answer: C
Solution:
Mass in the body of a healthy human adult has:-
Oxygen = 61.4%,
Carbon = 22.9%,
Hydrogen = 10.0% and Nitrogen = 2.6%
Total weight of person = 75 kg Mass due to $ {{,}^{1}}H $ is $ =75\times \frac{10}{100}=7.5,kg $ $ {{,}^{1}}H $ atoms are replaced by $ {{,}^{2}}H $ atoms.
So mass gain by person =7.5 kg
