An ice cube placed in an ideal thermos flask represents a/an ...... system.

The energy diagram for a reaction $R \to P$ is shown below. The $\Delta H^o$ for the reaction will be:

Which one of the following is not a state function?

What is molar enthalpy of vaporization?

$A$ sample of $1.0 \ mol$ of a monoatomic ideal gas is taken through a cyclic process of expansion and compression as shown in the figure. What will be the value of $\Delta H$ for the cycle as a whole?

What is a $System$ in thermodynamics?