Question

Energy required to dissociate 6 g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25°C. Bond energy of H-H bond will be ____________.

Options

• 69.33 kcal mol⁻¹

• 10.4 kcal mol⁻¹

• `52/6.023 xx 10^23` kcal mol⁻¹

• 52 kcal mol⁻¹

Answer 1

Energy required to dissociate 6 g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25°C. Bond energy of H-H bond will be 69.33 kcal mol⁻¹.

Explanation:

6 g H₂ ≡ 3 moles

∴ Bond energy = `(208  "kcal")/(3  "mol")` = 69.33 kcal mol⁻¹