The natural abundances of the two stable isotopes of hydrogen (hydrogen and deuterium) are 99.99 percent and 0.01 percent. assume that water exists as either _1^1 h_2o or _1^2 d_2o. calculate the number of d_2o molecules in 200.0 ml of water (density = 1.00 g/ml). enter your answer in scientific notation.

6.70 × 10²⁰ molecules of D₂O

Explanation:

The number of D₂O molecules is related to the abundance of deuterium. If the word "Hydrogen" refers to both isotopes, while H and D refer to each one.

We will use these relations:

The molar mass of water is 18.0g/mol

The molar mass of Hydrogen is 1.00 g/mol

Avogadro's number is 6.02 × 10²³

Every 100 atoms of Hydrogen, there are 0.01 atoms of D.

We can pose the following proportions: