Which of the following compounds would form an electrolyte in solution? a. CH4
b. H2O
c. CaF2
d. NH3

Can someone me with questions 12 and 13 plz.

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4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.