How many times oxygen gas heavier than hydrogen gas
answer with proper explanation

oxygen gas is more heavier than hydrogen gas,as for gases density depends upon the molar mass.So,H2 has more molar mass of 2g/mole than that of oxygen O2 is 32.
thus hydrogen gas is 16 times lighter than oxygen gas.
[   Molar mass-the mass of the given substance divided by its given substance.]