Calculating Mass of Substances (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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The Mole
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Mole (chemistry definition)

Unit to count particles like atoms or molecules

Number of particles in one mole

6.02×10236.02 \times 10^{23}

Name for 6.02×10236.02 \times 10^{23}

Avogadro's number

Who is Avogadro's number named after?

Amedeo Avogadro

Why chemists use moles instead of counting atoms

Atoms/molecules are too tiny to count individually

Mass of one mole in grams equals

Relative atomic mass (ArA_r) or relative formula mass (MrM_r)

Mass of one mole of carbon (CC)

12 grams (ArA_r = 12)

Mass of one mole of water (H2OH_2O)

18 grams (MrM_r = 18)

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Calculating Mass of Substances

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Calculating Mass of Substances

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