Question

Question #33d48

Answer 1

`3.01 * 10^23`

Explanation:

I assume you're referring to hydrogen gas.

`M_r` `H_2 = 2`

First, find number of moles of hydrogen gas.

Number of moles of `H_2` = `(1g)/(2g/(mol)) = 0.5 mol`

1 mol of `H_2` has `6.02 * 10^23` (Avogadro's constant) `H_2` molecules.

Hence, 0.5 mol would have half of that which is `3.01* 10^23` molecules of `H_2`.