Unit 1.1: Moles and Molar Mass

Convert between particles and moles use Avogadro's number: 6.02 × 10²³.

  1. How many moles are in 3.01 × 10²³ molecules of CO₂?
    0.5 moles

Calculate the molar mass of a chemical species.

  1. What is the molar mass of Ca(OH)2?
    74.09

Understand that the mass of a single particle in amu is equal to the mass of a mole of that species in grams.

  1. The mass of a single molecule of methane (CH4) is 12.04 amu. What is the molar mass of methane?
    16.04g/mol

Use molar mass to convert between mass and moles of a substance.

  1. How many moles are in 25.0 g of H₂O?
    1.4

Use subscripts to convert between a quantity of molecules and a quantity of atoms of a given element.

  1. How many hydrogen atoms are in 2 molecules of NH₃?
    6
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