The mass of one molecule of oxygen is equal to $..... \ kg$.

If the equivalent mass of $S$ in $SO_2$ is $8$,what is the equivalent mass of $S$ in $SO_3$?

In chlorine gas,the ratio of $Cl^{35}$ and $Cl^{37}$ is

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:

Calculate the molecular mass of glucose $[C_{6}H_{12}O_{6}]$ molecule. (in $u$)

Oxygen contains $90\%$ of $^{16}O$ and $10\%$ of $^{18}O$. Its atomic mass is