1-
(1)4C(s)5H2(g)—>C4H10(g)……-125.6
(2)C2H2(g)—>2C(s)H2(g)……-226.7
(3)2C2H2(g)3H2(g)–>C4H10(g)……
(1)2Fe(s)O2(g)–>2FeO(s)……-544.0
(2)Fe(s)Cl2(g)—>FeCl2(s)……-341.8
(3)2FeCl2(s)O2(g—>)2FeO(s)2Cl2(g)……
3-
4HCl(g)O2(g)—>2H2O(g)2Cl2(g)
2NO(g)O2(g)—>2NO2(g)
A scientist measures the standard enthalpy change for the following reaction to be -752.0 kJ :
2CO(g) + 2 NO(g)—>2CO2(g) + N2(g)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of NO(g) is ___ kJ/mol.
6- A scientist measures the standard enthalpy change for the following reaction to be -892.0 kJ :
4NH3(g) + 5 O2(g)–>4NO(g) + 6 H2O(g)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of NO(g) is ___  kJ/mol.