Problem: Choose the reaction that represents ΔH°f for Ca(NO3)2a. 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)

FREE Expert Solution

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.

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Problem Details

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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Based on our data, we think this problem is relevant for Professor Nafshun's class at OREGONSTATE.