Dulong and Petit's law is valid only for

Oxygen consists of $O^{16}, O^{17}$ and $O^{18}$ isotopes and carbon consists of isotopes of $C^{12}$ and $C^{13}$. Total number of $CO_2$ molecules possible are

The mass of one molecule of the compound $C_6H_{12}O_6$ is .........

In order to prepare one litre of a $1 \ N$ (normal) solution of $KMnO_4$,how many grams of $KMnO_4$ are required if the solution is used in an acidic medium for oxidation?

The equivalent weight of a divalent metal is $32.7$. The molecular weight of its chloride is .....

Which of the following statements is not true about atomic mass?