25.00 mL of heavy water (D2O where D is a hydrogen with a neutron in its nucleus) at 20 degrees C was pipetted into a 37.234 g beaker. The final mass of the beaker was 64.859 9

Question

a- what is the density of heavy water at 20 degrees C

b-The density of normal water (the hydrogens do not have neutrons) at 20 degrees C is 0.9982 g/mL. Calculate the density you would expect for heavy water by assuming the deuterium 2H or 2D is the same as normal hydrogen 1H when it is part of the water.

Answer 1

a.
mass D2O + beaker = 64.859
mass empty beaker.= -37.234
---------------------------
.........mass D2O = ??
Then density = mass/volume
V = 25.00 in the problem.

I don't understand b.

Answer 2

1.105