Weight of $112 \, mL$ of oxygen at $NTP$ on liquefaction would be .............. $g$.

Which of the following has the largest number of atoms?

$6.02 \times 10^{20}$ molecules of urea are present in $100 \ mL$ of its solution. The concentration of solution is $.... M$.

One mole of carbon atom weighs $12 \; g$. The number of atoms in it is equal to: (Mass of one carbon-$12$ atom is $1.9926 \times 10^{-23} \; g$)

The number of gram molecules of chlorine in $6.02 \times 10^{25}$ hydrogen chloride molecules is

If $19.7 \ kg$ of gold is confiscated from a thief,how many atoms of gold were confiscated from him? $(Au = 197 \ g/mol)$