sử dụng đl Hess tính \(\Delta H\)
Bài 1:
Ca(s) + \(\frac{1}{2}\)O2(g) -> CaO(s) \(\Delta H=-635,1kJ\)
CaCO3(s)-> CaO(s) + CO2(s) \(\Delta H=178,3kJ\)
Ca(s) + \(\frac{1}{2}\)O2 + CO2 -> CaCO3(s) \(\Delta H=?\)
Bài 2:
\(\frac{1}{2}\)N2 + \(\frac{1}{2}\)O2(g)->NO(g) \(\Delta H=90,3KJ\)
NO(g) + \(\frac{1}{2}\)Cl2 -> NOCl(g) \(\Delta H=-38,6kJ\)
2NOCl(g)-> N2(g) + O2(g) + Cl2 \(\Delta H=?\)
Bài 3:
Fe2O3(s) + CO(g) -> Fe(s) + CO2(g) \(\Delta H=?\)
(1) Fe2O3(s) + CO2(g) ->3FeO(s) + CO(s) \(\Delta H^O=-48,5kJ\)
(2) Fe(s) + CO2(g) -> FeO(s) + CO(g) \(\Delta H^O=-11,0kJ\)
(3) Fe3O4(s) + CO(g)-> 3FeO(s) + CO2(g) \(\Delta H^O=22kJ\)
Bài 4:
CIF(g) + F2(g) -> CIF3 (I) \(\Delta H=?\)
(1) 2CIF(g) + O2(g) -> Cl2O(g) + OF(g) \(\Delta H_{rxn}^O=167,5kJ\)
(2) 2F2(g) + O2(g) -> Cl2O(g) \(\Delta H_{rxn}^O=-43,5kJ\)
(3) 2CIF3(l) + 2O2(g) -> Cl2O(g) + 3OF2(g) \(\Delta H_{rxn}^O=394,1kJ\)
Bài 5:
(1) NO(g) + NO2(g) -> N2O3(g) \(\Delta H_{rxn}^O=-39,8kJ\)
(2) NO(g) + NO2(g) + O2(g)-> N2O5(g) \(\Delta H_{rxn}^O=-112,5kJ\)
(3) 2NO2(g)->N2O4(g) \(\Delta H_{rxn}^O=-57,2kJ\)
(4) 2NO(g) + O2(g) -> 2NO2(g) \(\Delta H_{rxn}^O=-114,2kJ\)
(5) N2O5(s) -> N2O5(g) \(\Delta H_{rxn}^O=54,1kJ\)
N2O3(g) + N2O5(s) -> 2N2O4(g) \(\Delta H=?\)
