The enthalpy change for the reaction A + 2B ? 3C, can be determined using the following equations:
(1) 2Z + C ? X ?H = 15 kJ(2) 2B + 3X ? 3Z ?H = 30 kJ(3) 6X ? A + 9Z ?H = 20 kJ
To do this, which of the following changes should be made to Equation 2?

Answer
No changes should be made.
The equation should be flipped.
The equation should be multiplied by a factor of 3.
The equation should be flipped and multiplied by a factor of 3.
The equation should be multiplied by a factor of ?.