Chemistry Problem?

Question

1) Hydrogen cyanide is used in the manufacture of clear plastics such as Lucite and Plexiglas. It is prepared from ammonia and natural gas (CH4).

2NH3(g) + 3O2(g) + 2CH4(g) --> 2HCN(g) + 6H2O(g)

The reaction evolves 739 kJ of heat per 2 mol HCN formed. What is the value of q (in kJ)?

2) Hydrogen sulfide, H2S, is produced during decomposition of organic matter. When 0.5000 mol H2S burns to produce SO2(g) and H2O(l) -282.7 kJ of heat is released. What is this heat in kilocalories?

Answer 1

1. Isn't it -739kJ?

2. 282.7kJ x 1000cal/4.184kJ = 67,570 cal