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QJEEM17Cheb27: JEE Main 2017 Chemistry - Class 11 JEEM17Cheb27 Solution: The most abundant elements by mass in the body of a healthy…

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:

Multiple Choice Options

  • A 37.5 kg
  • B 7.5 kg
  • C 10 kg
  • D 15 kg

Step-by-Step Verified Solution

Given that weight of human adult is = 75 kg

Among those 75 kg, 10% is Hydrogen(1H).

∴ Mass of 1H = 75×10100 = 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 = 2×7.5 = 15 kg.

So the weight gain by the person = 15 - 7.5 = 7.5 kg

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