The number of $H$ atoms in $27 \ g$ of water is .........

The weight of $112 \ cm^3$ of $CH_4$ gas at $STP$ is ...... $g$.

$1 \, \text{mol}$ of $CH_4$ contains

How many moles of oxygen atoms are present in $64.4 \ g$ of $Na_2SO_4 \cdot 10H_2O$?

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

Mahesh gifts a diamond ring of $0.1$ mole to Suresh on his birthday. How many grams of diamond did he gift?