When Should I Apply ΔH After Calculating Q in Thermodynamics?

[yuh_yuh]

TL;DR Summary

I just need help to understand when to apply ΔH T^T

I understand the difference between ΔH and Q, but when I calculate Q will I always calculate ΔH after it?

 

[Richard R Richard]

Always? , relate at least one situation in which you need to do it.

 

[Chestermiller]

Summary:: I just need help to understand when to apply ΔH T^T

I understand the difference between ΔH and Q, but when I calculate Q will I always calculate ΔH after it?

Do you know the difference between the definitions of $\Delta H$ and Q?