Deuterium, 2h (2.0140 u), is sometimes used to replace the principal hydrogen isotope 1h in chemical studies. the percent natural abundance of deuterium is 0.015%. part a if it can be done with 100% efficiency, what mass of naturally occurring hydrogen gas would have to be processed to obtain a sample containing 2.50ã1021 2h atoms?

Deuterium is isotope of hydrogen with percent natural abundance 0.015%. Thus, if 100 gram of naturally occurring hydrogen gas is taken it will have 0.015 g of deuterium.

Or,

or,

The number of deuterium atoms are given .

Since, 1 mol is equal to atoms thus,

Thus,   will be equal to

Molar mass of deuterium is 2.0140 u or 2.0140 g/mol thus, mass can be calculated as:

thus, mass of is 0.00836 g

Since,

Thus,

Therefore, mass of naturally occurring hydrogen gas that has to be processed is 55.73 g.