The molecular mass of sucrose $(C_{12}H_{22}O_{11})$ is (in $g/mol$)

$x_1 \, g$ of a compound combines with $O_2$ to give $x_2 \, g$ of oxide. The equivalent mass of the compound is .........

The approximate mass of a tritium oxide molecule is $............$ $amu$.

Chlorine exists in two isotopic forms $^{35}Cl$ and $^{37}Cl$. If the average atomic mass of chlorine is $35.5$,what is the percentage abundance of these isotopes respectively?

Elements $X$ and $Y$ form compounds $X_2Y_3$ and $X_3Y_4$ respectively. If $0.2 \ mol$ of $X_2Y_3$ weighs $32.0 \ g$ and $0.4 \ mol$ of $X_3Y_4$ weighs $92.8 \ g$,then the atomic masses of $X$ and $Y$ are respectively:

The chemical formula for calcium pyrophosphate is $Ca_2P_2O_7$. The formula for ferric pyrophosphate will be