Question

Based on the thermochemical equation below, which other equation shows the correct relationship between the chemical species and the enthalpy change?

3H₂+N2→2NH3, ΔH=−96 kJ
a) 32H₂+12N2→NH3, ΔH=−96 kJ
b) 32H₂​+12N2​→NH3​, ΔH=+48 kJ
c) 3H₂​+N2​→2NH3​, ΔH=+96 kJ
d) NH3​→32H₂​+12N2​, ΔH=+48 kJ

Answer 1

The correct equation that shows the relationship between the species and enthalpy change is d) NH₃ → 3H₂ + N₂, ΔH = +48 kJ.

Step-by-step explanation:

A thermochemical equation represents the changes in both matter and energy in a chemical reaction. The enthalpy change (ΔH) is shown as a value following the equation.

For the given equation 3H₂ + N₂ → 2NH₃, the correct equation that shows the relationship between the species and enthalpy change is d) NH₃ → 3H₂ + N₂, ΔH = +48 kJ. This equation is obtained by reversing the original equation and changing the sign of the enthalpy change value.