Question

If x₁, x₂ and x₃ are enthalpies of H–H, O=O and O–H bonds repectively, and x₄ is the enthalpy of vaporisation of water, estimate the standard enthalpy of combustion of hydrogen:
(a) $x_1 +\frac{x_2}{2} - 2x_3 + x_4$
(b) $x_1 +\frac{x_2}{2} - 2x_3 - x_4$
(c) $x_1 +\frac{x_2}{2} - x_3 + x_4$
(d) $2x_3 - x_1 - \frac{x_2}{2} - x_4$

Answer 1

Here is your answer ⤵⤵⤵

a) $x_1 +\frac{x_2}{2} - 2x_3 + x_4$

HOPE IT HELPS YOU ☺☺ !!!

Answer 2

Question :
If x₁, x₂ and x₃ are enthalpies of H–H, O=O and O–H bonds repectively, and x₄ is the enthalpy of vaporisation of water, estimate the standard enthalpy of combustion of hydrogen:
(a) $x_1 +\frac{x_2}{2} - 2x_3 + x_4$
(b) $x_1 +\frac{x_2}{2} - 2x_3 - x_4$
(c) $x_1 +\frac{x_2}{2} - x_3 + x_4$
(d) $2x_3 - x_1 - \frac{x_2}{2} - x_4$


___________________________________________

Correct Option :

___________________________________________

Explanation :