Equal masses of oxygen and ozone are present in a container at 298 K. The ratio of their partial pressures ($P_{O_2} : P_{O_3}$) is:

If you have 18g of water and 18g of oxygen, which contains a greater number of molecules?

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

How many moles are present in 18g of water (H2O)?

Which of the following has the maximum number of electrons

A mixture of $CO_2$ and $N_2$ gases contains 0.44 g of $CO_2$ and 0.56 g of $N_2$. The total number of moles of gases in the mixture is:

If Avogadro's number were $6.022 imes 10^{15} \, mol^{-1}$, what would be the mass of one mole of water (H$_2$O)? (Atomic masses: H = 1 u, O = 16 u)

7.5 gr of a gas occupy 5.8 L of volume at STP, the gas is

Which of the following pair of gases contain the same number of molecules?

A mixture of ${\rm{2}}{\rm{.3}}\,\,{\rm{g}}$ formic acid and ${\rm{4}}{\rm{.5}}\,\,{\rm{g}}$ oxalic acid is treated with conc. ${{\rm{H}}_{{\rm{2}}\,}}{\rm{S}}{{\rm{o}}_{\rm{4}}}$ . The evolved gaseous mixture is passed through ${\rm{KOH}}$ pellets weight (in g) of the remaining product at STP will be

How many water molecules are present in 36 grams of water?