What is the mole fraction of O2 in a mixture of 15.1g of O2, 8.16g of N2, and 2.46g of H2?

Question

(PLEASE EXPLAIN WHAT YOU DO!)

Thanks

Answer 1

Just using estimates, it look like you have about

0.5 moles of O2
0.3 moles of N2
1.2 moles of H2

So, the fraction of the total represented by O2 is

0.5/2.0 = 25%

Now you can refine that by using the real mole values.