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Chemistry C3 (Moles (One mole of a substance is equal to the relative…
Chemistry C3
Moles
One mole of a substance is equal to the relative atomic mass in grams if the substance in an element
One mole of a substance is equal to the relative formula mass in grams if the substance is a compound
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Balancing numbers - Calculate amounts of moles in the two substances, and divide both numbers by the smaller amount of moles
Uncertainty
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Uncertainty is ± half the smallest scale division, so a scale of 1 means uncertainty is ± 0.5
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Reaction pathways
When choosing how to go about creating a product, it depends on factors
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Concentration
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Concentration can be increased by dissolving more solute or decreased by evaporating some of the solvent
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Percentage yield
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Actual mass may be lower the theoretical mass as the reaction may not be completed as it is reversible, some of the product may be lost when separating or some of the reactants may react differently
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Avogadro's law
When temperatures and pressure stay the same, equal volumes of different gases contain and equal number of molecules
Equal amounts of moles of gases occupy the same volume under the same conditions of temperature and pressure
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Molar gas volume
Molar volume = Volume occupied by one mole of any gas, at room temperature and pressure
Molar volume = 24dm³ (24,000cm³)
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