Question

One mole of O2 has approximately the same mass as one mile of

Answer 1

I'm going to assume that you mean't mole instead of mile. One mole of O2 has approximately the same mass of one "mole" of N2. I say this because if these elements were rounded by their atomic mass, N would stay as 14, O would round up to 16, and we wouldn't; in this case, O2 would have approximately the same mass as F because F rounds up to 19 and the different between O and N is only 2 while the difference between O and F is 3.

Answer 2

As a reminder, the atomic mass of an atom equals the mass of a mole of this atom. 
Just so you know, a mole is defined as a quantity of 6.02x10^{23} things.
We know that the atomic mass of Oxygen is 16 so one mole of O2's mass is 16*2=32g.
So I guess we need to figure out something which a mole of will weight 32 g.
You can pick Ethanol which formula is CH3OH.
C has an atomic mass of 12
H has an atomic mass of 1
O has an atomic mass of 16
So one mole of CH3OH weights 12+(3*1)+16+1=32g which is the same amount.