C2. Quantitative chemistry

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what is the relative atomic mass (Ar)
the mass number
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what is the relative formula mass (Mr)
all the relative atomic masses added together
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what is one mole
the relative formula mass of a substance in grams
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number of moles=
mass in g DIVIDED BY relative formula mass (Mr) of element or compound
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percentage mass of an element in a compound=
(relative atomic mass (Ar) TIMES number of atoms (of that element)) DIVIDED BY relative formula mass (Mr) of whole compound... TIMES 100
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how do you work out empirical formula
mass of element DIVIDED BY the relative atomic mass (Ar) of that element, times by ten or one hundred and then divide by the highest common factor
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how do you calculate masses in reactions
work out moles of reactant (only the reactant the question is asking for) times by relative formula mass of product
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percentage yield=
actual yield (g) DIVIDED BY predicted yield (g) TIMES 100
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why are yields always less than 100%
reaction could be reversible and so reach equilibrium, lost in filtration, an unexpected reaction happens
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Other cards in this set

Card 2

Front

what is the relative formula mass (Mr)

Back

all the relative atomic masses added together

what is one mole

number of moles=

Card 5

Front

percentage mass of an element in a compound=