Question

What is the standard enthalpy change for the reaction \( C_2H_4(g) + 3 O_2(g) \rightarrow 2 CO_2(g) + 2 H_2O(g) \)?

A) -1323 kJ
B) -566 kJ
C) 44 kJ
D) 1323 kJ

Answer 1

The standard enthalpy change for the reaction C2H4(g) + 3 O2(g) -> 2 CO2(g) + 2 H2O(g) can be determined using Hess's law and the given enthalpy changes. The correct answer is D) 1323 kJ.

Step-by-step explanation:

The standard enthalpy change for the reaction C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O(g) can be determined using Hess's law and the given enthalpy changes.

One way to solve this problem is to write two equations that can be added together to give the desired equation and for which the enthalpy changes are known. By reversing the direction of the first equation and adding it to the second equation, we can obtain the desired reaction. The enthalpy change from these equations is equal to -138.4 kJ.

Therefore, the correct answer is D) 1323 kJ.