Heat of reaction at constant volume is measured in which apparatus?

The change in internal energy $\Delta U$ of an ideal gas depends on:

What is the constant external pressure of an ideal gas when expanded from $2 \times 10^{-2} \ m^3$ to $3 \times 10^{-2} \ m^3$,if the work done by the gas is $-5.09 \ kJ$?

Which of the following thermodynamic relations is correct?

Which among the following are intensive and extensive properties respectively?

Which of the following is an intensive property?