Question

Type the correct answer in the box. Express the answer to two significant figures. Given: N2 + 3H2 → 2NH3 Use the bond energies to calculate the change in enthalpy for the reaction. The enthalpy change for the reaction is [ ]kilojoules.

Answer 1

Answer: -78

Explanation: I got this right on Edmentum.

Answer 2

Step-by-step explanation:

Enthalpy change is defined as in a chemical reaction the amount of energy absorbed or evolved in the form of heat at constant pressure.

For the given reaction,
`N_(2) + 3H_(2) \rightarrow 2NH_(3)` calculate the enthalpy change as follows.

`\Delta H` = Bond energy of reactants - Bond energy of products

= {[(2 × 942) + (3 × 432)] - [6 × 386]} KJ/mol

= {[1884 + 1296] - 2316} KJ/mol

= {3180 -2316} KJ/mol

= 864 KJ/mol

Thus, we can conclude that the enthalpy change for the given reaction is 864 KJ/mol.