Question

Which one of the following statements is true? O H is the value of a measured under conditions of constant volume. The enthalpy change for a reaction is independent of the state of the reactants and products. Enthalpy is a state function. O Enthalpy is an intensive property. The enthalpy change of a reaction is the reciprocal of the AH of the reverse reaction. QUESTION 2 0.5 points Save Answer Given the following reactions N2 (g) + 2O2 (g) + 2NO2 (g) AH = 66.4 kJ 2NO(g) + O2(g) + 2NO2 (g) AH = -114.2 kJ the enthalpy of the reaction of the nitrogen to produce nitric oxide N2 (g) + O2(g) + 2NO (9) iskJ. O 180.6 O-180.6 O 47.8 O-47.8 O 90.3

Answer 1

1) True statement is enthalpy is a state function.

Enthalpy is equal to q at constant pressure. Enthalpy depends on states of reactants and products and is a extensive property. Enthalpy of a reaction is negative of enthalpy of opposite reaction.

2) Answer is 180.6 KJ.

Subtracting equation second from first we get required equation and it's enthalpy.

3) Answer is 799.9 KJ

54 g Al release 852 KJ heat

50.7 g Al release 852×50.7/54 = 800 KJ