WebHigher tier only calculations test questions - Edexcel 1 What is the mass of 5 moles of carbon? (Ar of Carbon = 12) 2.4 g 12 g 60 g 2 How many moles water (H2O) are in 90 g … WebIn a lot of reactions in which two reactants are used, it is common to use more of one of the reactants then is actually needed.When this is the case, this reaction is said to be in excess.This is make sure that we use up all of the other reactant. The reactant that is not in excess is known as the limiting reactant (also known as the limiting reagent).
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Chemical Calculations GCSE Science AQA Higher Tier
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