A 20 L vessel contains 0.1 mole of $O_2$ at 300 K. $O_3$ is prepared in the vessel by subjecting $O_2$ to silent electric discharge till the volume is reduced to 15 L at 300K. What is the number of moles of $O_3$ formed?

In which of the following is the number of water molecules maximum?

Which of the following has the largest number of atoms?

If Avogadro number, $N_A$, is changed from $6.022 imes 10^{23} \, mol^{-1}$ to $6.022 imes 10^{20} \, mol^{-1}$, this would change:

A 20 L vessel contains 0.1 mole of $O_2$ at 300 K. $O_3$ is prepared in the vessel by subjecting $O_2$ to silent electric discharge till the volume is reduced to 15 L at 300K. What is the number of moles of $O_3$ formed?

Rank the following samples from least to greatest number of atoms:

I. 5 g of $H_2$

II. 5 g of $O_2$

III. 5 g of $N_2$

IV. 5 g of $Cl_2$

Volume occupied by $3.01 imes {10^{23}}\;\;$ molecules of acetylene at NTP is:

A gaseous mixture contains oxygen and nitrogen in the ratio of $1:4$ by weight. Therefore, the ratio of their number of molecules is:

If you have 8g of He, 4g of $H_2$, and 32g of $O_2$, which sample has the highest number of molecules?

A 0.50 $M$ solution of $KI$ reacts with excess of ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ and ${\rm{KI}}{{\rm{O}}_3}$ solutions according to the equation, $6{{\rm{H}}^ + } + 5{{\rm{I}}^ - } + {\rm{IO}}_3^ - o 3{{\rm{I}}_2} + 3{{\rm{H}}_2}{\rm{O}}$. Which of the following statements is true?

A sample of hydrated copper sulfate (CuSO₄ ⋅ xH₂O) contains 0.25 moles of water. If the total mass of the hydrated salt is 62.5 g, and the anhydrous copper sulfate (CuSO₄) has a molar mass of 160 g/mol, what is the value of 'x' (the number of water molecules per formula unit)?