Which of the following is the number of hydrogen atoms in a mole of hydrogen gas at STP? pls i need help quickly a) 22.4
b) 1.008
c) 1.20 * 10^24
d) 6.02 * 10^23
e)2.016

C

Explanation:

The number of particles of any kind in 1 mol is 6.02*10^23.

How you modify that depends on the units.

The number of molecules in 1 mole of hydrogen is 6.02*10^23 molecules.

Each molecule consists of 2 atoms. Pure hydrogen at STP will have a multiplier of 2.

So the number of atoms is 2*6.02 * 10^23 = 1.20 * 10^24 atoms.