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

One mole of oxygen gas at $STP$ is equal to

How many moles are equivalent to $5.6 \ L$ of oxygen gas at $NTP$?

If every person on Earth is given $100$ molecules of sugar,how much sugar $(C_{12}H_{22}O_{11})$ is required? (Assume the population of Earth is $3 \times 10^{10}$ and the molar mass of sugar is $342 \ g/mol$)

Calculate the number of valence electrons in $4.2 \ g$ of $N_3^-$ ions in terms of $N_A$ ($N_A$ = Avogadro constant). (in $N_A$)

Find the number of hydrogen atoms present in $6.0 \ g$ of urea $(NH_2CONH_2)$: