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empirical and molecular formula notes-1
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Empirical And molecular formula• Empirical formula is the simplest formula which gives only the ratio of different elements
present in the compound.
• Molecular formula is the actual formula that gives the exact number of different elements
present in the sample.
• Eg: the empirical formula of glucose is 𝑪𝑯𝟐 O
• Its molecular formula is 𝑪𝟔 𝑯𝟏𝟐 𝑶𝟔 .
• By knowing the percentage composition, we can calculate the empirical and molecular
formula of a compound.
Stoichiometry and Stoichiometric calculations
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• The word 'stoichiometry' is derived from two greek words — stoicheion (meaning
element) and metron (meaning measure).
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• Thus stoichiometry deals with the calculations involving the masses or the volumes of
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reactants and the products.
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Chemical Equation
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• It is the representation of a chemical reaction by symbols and formulae. Here the
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reactants are written in the left hand side and the products, on the right hand side.
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• The substances which participate in a chemical reaction are called reactants
• The substances which are formed as a result of a reaction are called products.
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• A chemical equation should be balanced and the physical states Of reactants and products
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are written in brackets.
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• The following information’s are obtained from a chemical equation.
• 1. An idea about the reactants and products and their physical states.
• 2. An idea about the masses of reactants and products.
• 3. An idea about the number moles and molecules of reactants and products.
• 4. An idea about the volumes of reactants and products at STP.
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