Directions: For the following problems be sure to show the rearranged equations in the space provided below. Cross out any substances which will cancel and demonstrate that the reactions do add up to the overall reaction. Show all calculations related to the ?H's. To the left of the equations, on the line provided, write out what change you are making.
1. Calculate the ?H for the following reaction: (12 pts)
2 P + 5 Cl? ? 2 PCl?
Given the following information:
__________ PCl? ? PCl? + Cl? ?H = +87.9 kJ
__________ P + 3/2 Cl? ? PCl? ?H = -574 kJ
