Question

find the number of moles in 12g of oxygen

Answer 1

Here we are given the mass of oxygen gas as 12 grams

Formula of oxygen gas = O₂

Molar mass  = 2 × 16 = 32 grams.

We know the formula to calculate the no: of moles

No : of moles = Given mass ÷ Molar mass
                      = 12 ÷ 32 
                      = 0.375 moles

Answer 2

Here we are given the mass of oxygen gas as 12 grams


Formula of oxygen gas = O₂


Molar mass  = 2 × 16 = 32 grams.


We know the formula to calculate the no: of moles


No : of moles = Given mass ÷ Molar mass

                      = 12 ÷ 32 

                      = 0.375 moles