1.

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 .^(1)H atoms are replaced by .^(2)H atoms is

Answer»

15kg
37.5kg
7.5kg
10kg

Solution :Mass of hydrogen in healthy human audlt `=75xx(10)/(100)`
=7.5kg
if `._(1)^(1)H` isotope is replaced by `._(1)^(2)H` the mass of hydrogen =15G
Net gain in mass `=15kg-7.5kg`
=7.5kg


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