Quantitative ChemistryTopic Summary
Topic Summary: Moles and Quantitative Chemistry
Part of Moles & Calculations — GCSE Chemistry
This topic summary covers Topic Summary: Moles and Quantitative Chemistry within Moles & Calculations for GCSE Chemistry. Revise Moles & Calculations in Quantitative Chemistry for GCSE Chemistry with 22 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 15 of 15 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 15 of 15
Practice
22 questions
Recall
20 flashcards
Topic Summary: Moles and Quantitative Chemistry
Key Terms
- Mole: 6.02 × 10²³ particles
- Mr: sum of all Ar values; no units
- n = m ÷ Mr: moles formula
- % Yield: (actual ÷ theoretical) × 100
- Atom economy: (desired Mr ÷ all Mr) × 100
- Conservation of mass: total mass in = total mass out
Must-Know Facts
- Avogadro's constant = 6.02 × 10²³ mol⁻¹
- 1 mole weighs Mr grams (molar mass)
- Coefficients in equations = mole ratios
- % yield always < 100% in practice
- High atom economy = greener process
- 1 dm³ = 1000 cm³ (critical unit conversion)
- Concentration c = n ÷ V (mol/dm³)