# Percent Present Homework Questtion

#### Flopper

I've been stuck on this question and can't seem to figure out the right answer.

Question:

Heavy water has the formula D2O, and semi-deuterated water has the formula DHO, where D stands for deuterium. Using the data from the table, estimate the percentages of D2O and DHO present in natural water.

Element, Isotopeisotopic mass(u), Natural Abundance (%), Protons, Neutrons
Hydrogen, ^1H, 1.0078250321, 99.9850, 1, 0
Deuterium, ^2H, 2.0141017780, 0.0115, 1, 1

Find the %D20 in natural water AND %DHO in natural water

I have gotten 1.15 ×10^-4 and 2.30×10^-4 But these are incorrect. Please help. I try to calculate by multiplying the percent abundance

#### bjhopper

I've been stuck on this question and can't seem to figure out the right answer.

Question:

Heavy water has the formula D2O, and semi-deuterated water has the formula DHO, where D stands for deuterium. Using the data from the table, estimate the percentages of D2O and DHO present in natural water.

Element, Isotopeisotopic mass(u), Natural Abundance (%), Protons, Neutrons
Hydrogen, ^1H, 1.0078250321, 99.9850, 1, 0
Deuterium, ^2H, 2.0141017780, 0.0115,

Find the %D20 in natural water AND %DHO in natural wa

I have gotten 1.15 ×10^-4 and 2.30×10^-4 But these are incorrect. Please help. I try to calculate by multiplying the percent abundance[/QUOTE

according to Wiki DHO is 1 molecule in every 3200 molecules and 1 in every 6400 for D.D is given .0115% DHO is twice that