[student8607]

How much heat in kJ is evolved/absorbed in each of the following reactions

a. burning 15.5g of propane:
C₃H₈(g) + 5O₂(g) --> 3CO₂(g) + 4H₂O(l)            :delta: H = -2219kJ

I did 0.352mol x 2219kJ / 1 for the coefficient = 781kJ evolved

b. reaction of 4.88g of barium hydroxide octahydrate with ammounium chlroide:
Ba(OH)₂x8H₂O(s) + 2NH₄Cl(s) --> BaCl₂(aq) + 2NH₃(aq) + 10H₂O(l)       :delta: H = 80.3kJ
Not quite sure how to deal with this?