Identify the law for which the following statement is true.
"Equal volume of all gases at same temperature and pressure should contain equal number of molecules".

Which of the following pairs of compounds cannot demonstrate the law of multiple proportions?

If element $A$ combines with element $B$ in a ratio of $1:2$ by mass,and element $A$ combines with element $C$ in a ratio of $6:4$ by mass,then by which law do elements $B$ and $C$ combine with each other?

"Mass can neither be created nor destroyed" is the statement of

Two elements $x$ and $y$ have atomic masses $14$ and $16$ respectively. They form a series of five compounds $A, B, C, D, E$ in which the ratio of $x$ to $y$ is $1:2:3:4:5$. If compound $A$ contains $28$ parts by weight of $x$ and $16$ parts by weight of $y$,then in compound $C$,how many parts by weight of $x$ will combine with $24$ parts by weight of $y$?

In $SO_2$ and $SO_3$,the masses of oxygen that combine with $48 \, g$ of sulfur are respectively ......... .