Thermochemistry relating delta H and q of surroundings

[garr6120]

Homework Statement

Why does $\Delta H=\pm |q_{surroundings}|$?

Homework Equations

The Attempt at a Solution

Exothermic reactions have a $-\Delta H$ but does that mean that $q$ is a $+q$. Vice versa for a endothermic reaction. I get confused on which sign i should use for which when i do my thermochemistry questions.

 

[Chestermiller]

For an exothermic reaction at constant temperature and pressure, ΔH = q, and both are negative. For an endothermic reaction at constant temperature and pressure, ΔH = q, and both are positive.

Chet