Relating Moles to Coefficients of a Chemical Equation

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Joyce Kwan 12B                Chemistry – Mr. Thiedeman

Relating Moles to Coefficients of a Chemical Equation

Introduction: The definition of a mole is Avogadro’s number (6.02 x 1023) of particles (atoms, molecules, ions, electrons etc.). Moles are a very important part of chemistry especially in stoichiometry since it is part of many other calculation quantities and formulas including molar mass, solution calculations and gas volume calculations.

The mole is also used in chemical reactions and equations to calculate the amount of reactant needed to react completely with another reactant or to calculate the product produced from the amount of reactant provided and vice versa. This is done by using the ratio of the coefficients in a balanced equation. This ratio of coefficients is also known as the mole ratio.

        In the following experiment, a simple displacement reaction would occur from the reaction of an aqueous solution of copper (II) sulphate and zinc powder.

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Zn (s) + CuSO4 (aq)  ZnSO4 (aq) + Cu (s)

This reaction would be set up to allow the zinc to be the limiting factor therefore react completely, in order for that to happen, copper (II) sulphate would be in excess. As zinc is the limiting factor, it will be used to calculate the expected amount of copper produced from the 1 to 1 mole ratio of zinc and copper from the balanced equation above.

Aim: To find the mole ratio  of a reactant to a product in a chemical reaction .

Apparatus:         - Balance                                - Bunsen Burner

                - Two 150 cm3 Beaker                        - Glass ...

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