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Combined Science: Chemistry

GCSE · Edexcel · higher

QuestionsFlashcards

Group 1
- Group 1 (Alkali Metals)
  5
- Group 1: Reactivity & Electronic Configurations
  3
Group 7
Group 0

Deducing Stoichiometry Flashcards

All 3 cards in this deck

What does the stoichiometry of a reaction mean?: The balancing numbers in the equation — the mole ratio in which the substances react and are formed.
When deducing the stoichiometry of a reaction from reacting masses, what gives the balancing numbers?: The simplest whole-number ratio of the moles of each substance, where moles = mass (g) ÷ relative mass ( $A_r$ or $M_r$ ).
When finding moles of iron from a mass for an equation written as $2\mathrm{Fe}$ , what relative mass must you divide by?: 56 (the $A_r$ of one Fe atom), not 112.