Which of the following compounds is $NOT$ present in its standard state at $25^{\circ} C$ and $1 \text{ atmosphere}$ pressure?

Two moles of an ideal gas are expanded isothermally from $15 \ dm^3$ to $20 \ dm^3$. If the amount of work done is $-6 \ dm^3 \ bar$,find the external pressure needed to obtain this work.

The total number of intensive properties from the following is $........$.
Volume,Molar heat capacity,Molarity,$E^{\theta}_{cell}$,Gibbs free energy change,Molar mass,Mole

For the process $CO_2(s) \rightarrow CO_2(g)$,which of the following is true?

Fill in the blanks:
$(i)$ $A$ system that allows the exchange of energy but not matter with the surroundings is called a ........ .
$(ii)$ The total amount of energy consisting of the internal energy of a substance plus the product of its pressure and volume is called ........ .
$(iii)$ The change in energy that occurs when a chemical reaction is carried out at constant pressure is called ........ .

Which of the following properties of a system depends upon the amount of matter and the path taken?