We’re being asked to determine the balanced chemical equation for the reaction used to calculate the standard enthalpy of formation of Ca(NO3)2(s).
Recall that the standard enthalpy of formation (ΔH˚f) refers to the enthalpy change for the formation of 1 mole of a compound from its elements in their standard states.
Choose the reaction that represents ΔH°f for Ca(NO3)2
a. Ca2+(aq) + 2NO3-(aq) → Ca(NO3)2(aq)
b. Ca(s) + 2N(g) + 6O(g) → Ca(NO3)2(s)
c. Ca(NO3)2(aq) → Ca2+(aq) 2NO3-(aq)
d. Ca(s) + N2(g) + 3O2(g) → Ca(NO3)2(s)
e. Ca(NO3)2(s) → Ca(s) + N2(g) + 3O2(g)
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