Chemistry / Unit 9 Chem 1604 short lesson, about 20 seconds
Relative Reaction Rates from Stoichiometry
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The idea
In one reaction, every substance's rate of change relates to every other's through the balanced equation's stoichiometric coefficients.
In practice
When ammonia decomposes to nitrogen and hydrogen, hydrogen forms three times as fast as nitrogen, matching their 3:1 coefficient ratio.
Where people slip
Two substances in the same reaction rarely change concentration at equal rates — only equal coefficients produce equal rates.
Your place on the trail
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