Question

What weight of oxygen gas will contain the same number of molecules as 56g of nitogen gas? How?

Answer 1

Atomic mass of N2(nitrogen gas) is 28.
so 56 gram of N2 contains
2 mole N2 =2× 6.022×10^23

so we also need 2 mole of oxygen (O2)
as 1 mole oxygen=32 grams
so 2 mole oxygen=64 grams


hennce weight of oxygen needed
is 64 grams