Question

①28克铁在氧气中燃烧生成Fe3O4固体,放出187kJ热量

Answer 1

3 Fe(s) + 2 O2(g) ==== Fe3O4(g)；△H = -1122 kJ/mol

0.5 mol Fe燃烧放出 187 kJ的热量,

所以3 mol Fe燃烧会放出3*187 = 1122 kJ的热量,△H= -1122 kJ/mol

CS2(l) + 3 O2(g) ==== CO2(g) + 2 SO2(g)；△H = -1035.6 kJ/mol

0.05 mol CS2燃烧放出 51.78 kJ的热量,

所以1 mol CS2燃烧会放出51.78 * 20 = 1035.6 kJ的热量,△H= - 1035.6 kJ/mol