In SO2 and SO3, the ratio of the masses of oxygen which combine with a fixed mass of sulphur is 2:3. This is an example of the law of _______.

A/an _______ is an aggregate of two or more atoms in definite composition which are held together by chemical bonds.

The unit of atomic mass amu is replaced by _______.

_______ chemistry deals with the chemistry of elements other than carbon and of their compounds.

Atoms have a mass of the order _______.

Pure water can be obtained from various sources, but it always contains hydrogen and oxygen, combined in a ratio of 1:8 by weight. This is an example of _______.

How many molecules are present in one gram of hydrogen gas?

If two or more phases are present in a mixture then it is called a _______ mixture.

One mole of H₂O corresponds to _______.

The sum of the masses of reactants and products is equal in any physical or chemical reaction. This is in accordance with law of _______.