Consider the following intermediate chemical equations. The overall chemical equation is . To calculate the final enthalpy of the overall chemical equation, which step must occur?
Answer
A
Reverse the first equation, and change the sign of the enthalpy. Then, add.
B
Reverse the second equation, and change the sign of the enthalpy. Then, add.
C
Multiply the first equation by three, and triple the enthalpy. Then, add.
D
Divide the third equation by two, and double the enthalpy. Then, add.