Chemical Arithmetics
Telangana Open School (TOSS) · Class 12 · Chemistry
All formulas from Chemical Arithmetics in Telangana Open School (TOSS) Class 12 Chemistry. Key equations, constants, and identities for board exam preparation.
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Formulas
Molecular and Empirical Formulae
Molecular Formula = (Empirical Formula) × n
Percentage Composition
% mass of element = (mass of element in 1 mol compound / molar mass of compound) × 100
Determination of Empirical Formula
Step 1: % → Mass in 100g → Moles → Divide by smallest → Multiply to whole numbers
Reaction Stoichiometry
Mole Ratio = Coefficients from Balanced Equation
Mass = Moles × Molar Mass
Volume of gas at STP = Moles × 22.7 L/mol
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