How much energy is produced in the burning of $1\, kg$ of coal?

At temperatures close to $0\ K$, the heat capacity $C$ of a certain solid is related to its temperature $T$ by the equation $C = aT^3$, where $a$ is a constant characteristic of the solid. Heat is supplied to the solid at a steady rate. Which graph best represents the variation of its temperature $T$ with time $t$?

The temperature of $5$ moles of a gas at constant volume is changed from $100^{\circ} C$ to $120^{\circ} C$. The change in internal energy is $80 \,J$. The total heat capacity of the gas at constant volume in $J/K$ is:

Which of the following substances has the maximum specific heat capacity?

The $S.I.$ unit of specific heat capacity is

The molar mass of a substance is $50 \, g/mol$. When $300 \, J$ of heat is supplied to a $25 \, g$ sample of this substance,its temperature increases from $30^{\circ}C$ to $50^{\circ}C$. The values of heat capacity and specific heat capacity are,respectively: