Percentage Composition Atomic mass Relative no. of atoms = Percentage Atomic mass Simple ratio C . % . / = .
= Empirical formula (C H O) . Element Percentage Composition Relative no. of atoms = Percentage Atomic mass Atomic mass= Percentage Relative no. of atoms Simple ratio X % Y % Z % .
Empirical formula (X Y Z) Calculated empirical formula mass ( ) ( ) molar mass calculated empirical formula mass ∴ ∴ Molecular formula (X Y Z) = X Y Z 11th Std Chemistry 11th Std Chemistry - - - - . Content Reactant Products x y l m Stoichiometric coefficient No. of moles allowed to react – – No. of moles of reactant reacted and product formed No.
of moles of un-reacted reactants and the product formed – Limiting reagent : x Product formed : moles of l & moles of m Amount of excess reactant : moles of y . As S HNO H AsO H S O NO → ×2e – 4e – + 24e – 28e – 3e – ×8e – Equate the total no. of electrons in the reactant side by cross multiplying, ⇒ As S + HNO → H AsO + H SO + NO Based on reactant side, balance the products ⇒ As S + HNO → H AsO + H SO + NO Product side : hydrogen atoms & oxygen atoms Reactant side : hydrogen atoms & oxygen atoms Difference is hydrogen atoms & oxygen atoms ∴ Add H O