What is the weight in $g$ of $2.01 \times 10^{23}$ molecules of $CO$?

Number of atoms present in $224 \, dm^3$ of oxygen gas at $STP$ is

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 $N_A = 6.0 \times 10^{23} \ mol^{-1}$)

How much time would it take to distribute one Avogadro number of wheat grains,if $10^{10}$ grains are distributed each second?

How many atoms are contained in one mole of sucrose $C_{12}H_{22}O_{11}$?

Total number of atoms represented by the compound $CuSO_4 \cdot 5H_2O$ is