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Linking Moles, Mass and Mr

Calculating Moles

  • In laboratories, chemicals react in specific ratios, but we measure them in grams using digital balances due to the impracticality of measuring moles directly.
  • Conversion between moles and grams is essential.
  • The formula for converting moles, mass in grams, and molar mass is crucial.
  • The molar mass represents the mass of one mole of a substance.
  • For an element, the molar mass equals the relative atomic mass in grams.
  • For compounds, the molar mass equals the relative formula or molecular mass in grams.

The Moles & Mass Formula Triangle

The Moles & Mass Formula Triangle

MULTIPLE CHOICE QUESTION
Try yourself: What is the formula for converting moles to grams?
A

Molar mass = moles x mass in grams

B

Mass in grams = moles x molar mass

C

Moles = molar mass / mass in grams

D

Moles = mass in grams / molar mass

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