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Q.

The most abundant elements by mass in the body of a healthy human adult are oxygen (61.4%), carbon (22.9%) Hydrogen (10%) and Nitrogen (2.6%). The weight which a 75kg person would gain if all $^{1} H$ atoms are replaced by $^{2} H$ atoms is 2.5x. Value of x is

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answer is 3.

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Detailed Solution

% H = 10 % So weight due to $^{1} H$ is 7.5 kg
Due to $^{2} H$ is 15.0 kg
Increase in weight = 7.5 kg
x = 3

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The most abundant elements by mass in the body of a healthy human adult are oxygen (61.4%), carbon (22.9%) Hydrogen (10%) and Nitrogen (2.6%). The weight which a 75kg person would gain if all 1H atoms are replaced by 2H atoms is 2.5x. Value of x is