The mass of a hydrogen atom is
1.67 × 10-24 grams.
-23
The mass of an oxygen atom is 2.66 × 107
grams.
A molecule of water contains 2 atoms of
hydrogen and 1 atom of oxygen.
a) Calculate the mass of one molecule of
water
Give your answer in standard form.
b) Calculate the number of molecules in 1
gram of water.
Give your answer in standard form to 3
significant figures.