Question

how to convert into mole a) 12 gram of Oxygen gas b) 20 gram of water

Answer 1

a) Molecular mass of O2=32 g
No. of moles= Given mass/molecular mass
=12/32
=0.375 mole
b) Molecular mass of H2O=18 g
No. of moles= Given mass/molecular mass
=20/18
=1.11 mole