Question

convert 12 g pf o2 gas into mole

Answer 1

mole is equal to given mass/mole mass .
mole =12/16×2 ( O2 has 2 atom of oxygen)
=3/8 mole

Answer 2

mole is equal to given mass/mole mass .  ....................................

mole =12/16×2 ...............................( O2 has 2 atom of oxygen)

=3/8 mole