question and help

At one time, a common means of forming small quantities of
oxygen gas in the laboratory was to heat KClO3:
2 KClO3(s)¡2 KCl(s) + 3 O2(g) ¢H = -89.4 kJ
For this reaction, calculate ¢H for the formation of (a) 1.36
mol of O2 and (b) 10.4 g of KCl. (c) The decomposition of
KClO3 proceeds spo…