$A$ thermos flask containing some ice cubes is sealed tightly. This is an example of which type of system?

Which of the following is an extensive property?

For the reaction $H_{2}F_{2(g)} \rightarrow H_{2(g)} + F_{2(g)}$,$\Delta U = -59.6 \ kJ \ mol^{-1}$ at $27^{\circ} C$. The enthalpy change for the above reaction is $(-)$ $kJ \ mol^{-1}$ [nearest integer]. Given: $R = 8.314 \ J \ K^{-1} \ mol^{-1}$.

In the equation $C_P - C_V = R$,what does $R$ represent?

How does a thermal power plant work?

Which of the following is true for the value of $\Delta H - \Delta U$ at constant volume?