Question
Choose the reaction that illustrates H°f for Ca(NO3)2.
 

Question 10 options:

 
Ca(s) + N2(g) + 3O2(g)  Ca(NO3)2(s)
 
Ca2+(aq) + 2 NO3-(aq)  Ca(NO3)2(aq)
 
Ca(s) + 2 N(g) + 6 O(g)  Ca(NO3)2(s)
 
Ca(NO3)2(aq)  Ca2+(aq) + 2 NO3-(aq)
 
Ca(NO3)2(s)  Ca(s) + N2(g) + 3O2(g)

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