Question

calculate the percentage mass of oxgen in water, H2O​

Answer 1

Answer:

the mass of oxygen in water is 16.00.

Answer 2

water, h2o, has a molar mass of 18.015
oxygen has a molar mass of 15.999

15.999/18.015 is 0.880932556
multiply this by 100 to get:
88.8% of oxygen


hope this helped!