In which one of the following cases, `Delta H and DeltaU` are not equal to each other?

In which of the following cases, a unique triangle can be drawn

For which of the following reactions, DeltaH is equal to DeltaU ?

For which of the following reactions, DeltaH is equal to DeltaU ?

In which of the following reactions is Delta H not equal to Delta E ?

For which one of the following equations is Delta_(r) H^(theta) equal to Delta_(f) H^(theta) for the product ?

For which of the following reactions, Delta H is equal to Delta U ?

In which of the following cases, a right triangle cannot be constructed ?