Reacting Masses (AQA A-Level Chemistry): Flashcards

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Reacting Masses
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What do reacting masses calculations determine?

Amount of reactant needed or product formed

Formula: moles from mass

Moles=MassMr\text{Moles} = \frac{\text{Mass}}{M_r}

Formula: mass from moles

Mass=Moles×Mr\text{Mass} = \text{Moles} \times M_r

What does a balanced equation provide for reacting masses?

Mole ratio between reactants and products

MrM_r of H2OH_2O

18 g/mol

MrM_r of O2O_2

32 g/mol

MrM_r of CO2CO_2

44 g/mol

MrM_r of CaCO3CaCO_3

100 g/mol

MrM_r of NaOH\text{NaOH}

40 g/mol

Step 3 in reacting masses calculation

Calculate moles of unknown using mole ratio

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