LearnOS · A-Level Chemistry
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Physical, inorganic and organic chemistry. Explore real topic objectives and a guided sample of how the subject is taught. Browse every section before deciding to subscribe.
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Maya · Chemistry
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Public demonstration · Chemistry
Amount of substance: Find moles in 9.0 g of water (Mᵣ = 18.0).
n = mass ÷ molar mass = 9.0 ÷ 18.0 = 0.50 mol.
Always connect the calculation to the particle-level meaning of a mole.
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