Question

A sample of pure water,whatever the source always contains __________ by mass of oxygen & 11.1%by mass of hydrogen. a)88.8 b)18 c)80 d)16
​

Answer 1

Answer:

• 88.8 because total of percentage is always 100
• then correct explanation is ratio of H2 and O2 mass in water is 1 is to 8
• so mass of oxygen is88.8
• This is according to law of conservation of mass