There are two gas compounds that are made out of element  A and B. This is the mass percentage of the two compounds. Compound 1: 30.43% A, 69.57% B Compound 2: 63.64% A, 36.36% B In a normal state element A and B exist as a gas. (It can be mono atomic molecule, diatomic molecule or triatomic molecule) When you react gas A and gas B and make a product these things come out. (All in same temperature and pressure) 1 Volume of Gas A + 2 Volume of Gas B = 2 Volume of Compound 1 2 Volume of Gas A + 1 Volume of Gas B = 2 Volume of Compound 2 Determine the relative mass of element A and B from the reaction formula above. Also you should assume the simplest chemical formula of reactant and products

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.