1- Given the standard enthalpy changes for the following two reactions: (1) 4C(s) + 5H 2 (g)—C 4 H 10 (g) . H = -125.6 kJ (2) C 2 H 2 (g)—2C(s)…

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.

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