Chemical Calculations

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Calculating the Percentage Composition

% =   total mass of ( N ) atom              x100

        Mass number of the compound 

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Calculation the percentage yield

Percentage yield = actual mass of required product        x100

                            theoretical mass of required product

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Calculating if a reaction is exothermic and endoth

1. Breaking all the bonds in the reactant ( the starting material )  2. Make new bonds forming the product ( what is made during the reaction ) 

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