Plz check the answer ..i think it's wrong a,b,o, (s) and na,b,0, 10h,0 (s) are -742 and -1460 kcal respectively. calculate the heat of hydration

-43 kcal 4 43 kca -64 kcal 19. The heats of formation of Na,B,O, (s) and Na,B,0, 10H,0 (s) are -742 and -1460 kcal respectively. Calculate the heat of hydration of Na,B,O, in forming decahydrate. -718 kcal 20. The heats of combustion of graphite and diamond -395 kJ/mole respectiu