How many electrons are there in 2 g of H2

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  =  

  Molar mass of H₂   = 2(1)  = 2g/mol

Number of moles  =   = 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.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).