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Year 10 - Science

Converting between mass and volume using moles (RAM 1 d.p.)

Calculations involving masses

Unit Summary

This unit covers writing chemical formulae, balancing equations, and using the conservation of mass. It includes calculating moles, empirical formulae, relative formula masses, and theoretical yields. Emphasis is on stoichiometry, concentration, gas volumes, and using standard form.

Lesson Summary

You will learn to combine mathematical relationships to calculate an unknown mass or volume.

Key Notes

  • The volume of one mole of any gas at room temperature and pressure (20℃ and 1 atmosphere pressure) is 24 dm³.
  • Reacting mass calculations can use a combination of mass to volume calculations and vice versa.
  • Amount of substance (moles) can be calculated using multiple equations.
  • The choice of equation for calculating moles depends on the context of the problem or calculation.

Vocabulary To Learn

  • mole: A mole of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams.
  • volume: Volume is how much 3D space matter occupies. It is usually measured in cm³.
  • molar gas volume: Molar gas volume is the volume occupied by one mole of any gas. It is equal to 24 dm³ or 24 000 cm³ at room temperature and pressure.
  • stoichiometry: Stoichiometry refers to the molar ratio of the reactants and products in a chemical reaction.
  • balanced symbol equation: A balanced symbol equation describes a reaction using a symbol equation with coefficients, which ensure there are equal numbers of atoms of each element on both sides of the symbol equation.

Common Mistakes To Avoid

  • Pupils use an incorrect mathematical relationship to calculate the number of moles in a sample.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

The volume of one mole of any gas at room temperature and pressure (20℃ and 1 atmosphere pressure) is 24 dm³. Reacting mass calculations can use a combination of mass to volume calculations and vice versa.

2. Define this scientific word and use it in context. 'mole'

A mole of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils use an incorrect mathematical relationship to calculate the number of moles in a sample. Correction: Depending on the type of substance (solid, solution or gas) a specific mathematical relationship for moles must be used. Challenge pupils to classify substances as (s), (aq), or (g) and apply correct mathematical relationship.

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