Verified answer

To find number of mole if you are given number of particles, you should divided it with Avogadro Constant.

n=9.03 x 10^23/6.02 x 10^23

n=1.5 mol

Just divide this given number of molecules by the number of molecules in a mole which is 6.02 x l023. Looks like one and a half moles of hydrogen.