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This PPT file covers stochiometry.

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Chapter 110011 0010 1010 1101 0001 0100 1011124Stoichiometry11.1 The Arithmetic of Equations0011 0010 1010 1101 0001 0100 1011 Chemists use balanced chemical equationsas a basis to calculate how much reactant isneeded or product is formed in a reaction.12 Stoichiometry calculation of quantities inchemical reactions4Interpreting Chemical Reactions A balanced chemical equations can beinterpreted in terms of different quantities,including .. number of atoms, moleculesor moles, mass and volume.0011 0010 1010 1101 0001 0100 1011 N2 (g) + 3H2 (g)122NH3 (g)4Number of atoms0011 0010 1010 1101 0001 0100 1011 N2 (g) + 3H2 (g)2NH3 (g) At the atomic level. A balanced chemical equation indicates thatthe number and type of atom that makes upeach reactant , also make up each product.124Number of Molecules0011 0010 1010 1101 0001 0100 1011 N2 (g) + 3H2 (g)2NH3 (g)12 Balanced chemical equation gives you theratio of molecules1: 3: 210: 30: 204Number of moles0011 0010 1010 1101 0001 0100 1011 N2 (g) + 3H2 (g)2NH3 (g)12 The coefficients of a balanced chemicalequation also tells you the number of molesof reactants and products4Mass0011 0010 1010 1101 0001 0100 1011 N2 (g) + 3H2 (g)2NH3 (g)12 A balanced chemical equation obeys thelaw of conservation of mass The total mass of the atoms in the reactiondoes not change4

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