Chemistry - calculations of reacting masses, gas volumes and percentage yield

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5 Terms

1
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number of moles

mass of substance/Ar or Mr

2
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stoichiometry of a reaction…

refers to the mole ratio of the reactants and the products

3
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number of moles (gas)

volume of gas in dm³/24

volume of gas in cm³/24000

4
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percentage yield

actual mass/theoretical mass x 100

5
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why do organic reactions often give yield much less than 100%?

material is lost each time the product is transferred from one piece of apparatus to another when subject to recrystallisation or distillation

many reactions do not go through to completion as they produce equilibrium mixtures

may be side reactions occurring or impurities present in the reagents