Question

How many mega coulombs of charge is present in 2.0 mole of neutral Hydrogen (H2) gas?

Answer 1

Total number of electrons in 1 molecule of H₂ = 2
Total number of electrons in 1 mole of H₂ = 2 × Avagadro number

Charge on 1 electron = 1.6 × 10^-19 C

Charge on 2 × Avagadro number of electrons = 2 × Avagadro number × 1.6 × 10^-19 C
= 2 × 6.022 × 10^23 × 1.6 × 10^-19 C
= 0.19 × 10^6 C
= 0.19 Mega Coulomb

Charge on 1 mole of neutral hydrogen gas is 0.19 Mega Columb

Answer 2

Answer:

No. of Hydrogen molecules present in 1 mole = 6.023 × 10^23

No. of molecules present in 2 mole of neutral hydrogen gas is = 2 × 6.023 × 10^23

Since 1 molecule of Hydrogen has 2 electrons ,

then 2 mole hydrogen gas will have 2× 2× 6.023 ×10^23.

We know,

Q = ne

Or, Q = 2×2×6.023×10^23 ×1.6 ×10^(-19)

Or, Q = 385,472

since the answer was asked in Mega Coulombs. we will divide the answer by 10^6

Therefore, the no. of megacoulomb charge present in 2.0 mol of neutral hydrogen gas is 385,472/10^6 = 0.385 MC.