Question

How many moles of oxygen are present in 18 gms Water?

• A. 4
• B. 2
• C. 1
• D. 5

Answer 1

The correct option is C

1

Moles of Water = Given mass/ Molar mass

= 18/ 18 (molar mass = 16+2) = 1

So,

1 mole of $H_2$O contains 1 mole of oxygen and 2 moles of hydrogen