Question

What is true for the following reaction? Ca(s) + 2C(s) CaC2(s) + 62.8 kJ It is an endothermic reaction and ∆H= +62.8 kJ. It is an endothermic reaction and ∆H= -62.8 kJ. It is an exothermic reaction and ∆H= +62.8 kJ. It is an exothermic reaction and ∆H= -62.8 kJ. This reaction will not occur.

Answer 1

if i am reading correctly, the heat amount (+62.8Kj) is on the right side of the reaction. 

If the heat is on the products (right side of the reaction), that means the reaction is exothermic (heat is released as a product). exothermic reactions have negative ΔH values. so the values for this ΔH= -62.8 kj.

the answer is "It is an exothermic reaction and ∆H= -62.8 kJ"