Question

How many electrons are there in 2 g of H2

Answer 1

Answer:

6.02 x 10²³ electrons

Explanation:

Given parameters:

Mass of H₂  = 2g

Unknown:

Number of electrons = ?

Solution:

To find the number of electrons, we must determine the number of moles of H₂ first.

 Number of moles  = $\frac{mass}{molar mass}$  

  Molar mass of H₂   = 2(1)  = 2g/mol

Number of moles  = $\frac{2}{2}$   = 1mol  

1 mole of a substance contains 6.02 x 10²³ particles

the particles can be protons, neutrons, electrons

So,

  2g of H₂ will contain 6.02 x 10²³ electrons.