One mole of a gas represents......

The total number of molecules of $SO_2Cl_2$ in $13.5 \ g$ of sulfuryl chloride is ..... (in terms of $N_A$) (in $N_A$)

The number of atoms in $4.25 \ g$ of $NH_3$ is approximately

The ratio of the number of oxygen atoms $(O)$ in $16.0 \ g$ ozone $(O_3)$,$28.0 \ g$ carbon monoxide $(CO)$,and $16.0 \ g$ oxygen $(O_2)$ is (Atomic mass: $C = 12$,$O = 16$ and Avogadro's constant $N_A = 6.0 \times 10^{23} \ mol^{-1}$)

What is the number of moles of nitrogen atoms present in one mole of cytosine?

In a sample of $CaCO_3$,there are $3.01 \times 10^{23}$ ions of $Ca^{+2}$ and an equal number of $CO_3^{-2}$ ions. The mass of the sample is = $......$ grams.