Question

how many molucules in 1kg of oxigen gas?

Answer 1

The idea here is that 1 kg-mole is equal to 103 moles. This is the case because a mole of a substance must contain a number of particles of that substance equal to the number of atoms present in exactly 12 g of carbon

Answer 2

mole=given mass divided by molecular mass
mole=molecule or atom or ion divided by avagadro no.
so,given mass/mmolecular mass =molecule or atom or Ion/ Avogadro number

Given _1 kg of Oxygen gas
solution .
given mass /molecular mass
given mass is 1 kg
1 Kg is equal to 1000 gram
molecular mass of oxygen is 16 gram
but
given mass / molecular mass =given molecule or atom or Ion/ Avogadro number
1000 gram/ 16 gram =N/No.
1000g/16g=N/No.
62.5g=N/No.
N=No./62.5
N=0.096352 multiply by 10 power23