Question

find mole of 24 gm of O2​

Answer 1

Molar Mass = 2 * 16

= 32 g

no. of moles = 32 / 24

= 1.333

Answer 2

O2 has a g-mol weight of 2g, so 24g would be 24/2 = 12 mol..

assume, like the answers given, that you are asking about the number of moles of oxygen molecules? And that’s what has been answered; though three answers with three different results.

Just to clarify that bit, molecular oxygen (O2) has a molecular mass of 31.998 g/mol. For simplicity, let’s round that to 32 g/mol.

Since n=mM, that means that n=24g32g/mol = 0.75 mol, as ’s answer states.

But just to be a bit pedantic; you don’t specify the number of moles of what! From your question, you could also mean the number of oxygen atoms (that would of course then be twice as much, the 1.5 moles that states). Or you could be asking for the number of electrons? Then the answer would be 12 mole