One mole of H₂SO₄ = ____ moles of oxygen.

Sulphur is molecule is composed of eight similar atoms hence it is

A certain hydrocarbon has the following percentage composition C = 83.72% and H = 16.27%. The vapour density of the compound to be 43. The molecular formula of the compound is

Percentage of calcium in calcium carbonate  (CaCO₃) is

A sample of CaCO₃ contain 3.01 × 10²³ ions of Ca²⁺ and CO₃^2-. The mass of the sample is

The relative molecular mass of a gas or vapour is ___ of its vapour density.

The gas law which relates the volume of a gas to the number of molecules of the gas is

Inert gases are

Which number is defined as the number of atoms present in 12g of C-12 isotope?

If empirical formula of an organic compound is CH₂O then its molecular formula can be