What is the number of moles of water molecules present in a mole of carnallite?

What is the number of oxygen atoms in $8 \ g$ of ozone $(O_3)$?

How will you differentiate $0.50 \ mol$ $Na_2CO_3$ and $0.50 \ M$ $Na_2CO_3$?

Natural abundances of $^{12}C$ and $^{13}C$ isotopes of carbon are $99\,\%$ and $1\,\%$,respectively. Assuming they only contribute to the molecular weight of $C_2F_4$,the percentage of $C_2F_4$ having a molecular mass of $101$ is $.....$

Calculate the number of moles present in $9.10 \times 10^{-2} \ kg$ of water.

The mass of $2 \times 10^{22}$ nitrogen atoms is ..... grams.