Q1
What is Avogadro's number?
A6.022×10²³
B6.022×10¹⁰
C3.14×10²³
D1×10²³
ICSEClass 10 (ICSE)ChemistryCh 5 · Topic 1
Mole Concept and Stoichiometry
The mole concept relates mass, number of particles, and volume of substances, forming the basis for stoichiometric calculations in chemistry
Core concept
One mole of any substance contains 6.022×10²³ particles (Avogadro's number), whether atoms, molecules, or ions.
How it works
Molar mass is the mass of one mole of a substance in grams, numerically equal to its atomic or molecular mass.
Why it matters
At STP (standard temperature and pressure), one mole of any gas occupies 22.4 litres, known as molar volume.
Key detail
Stoichiometry uses balanced chemical equations to calculate the amounts of reactants and products involved in a reaction.
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• 1 mole = 6.022×10²³ particles (Avogadro's number).
• Molar mass = mass of 1 mole in grams.
• It equals atomic/molecular mass numerically.
• At STP, 1 mole of gas = 22.4 litres.
• This is called molar volume.
• Stoichiometry uses balanced equations.
• It calculates reactant/product amounts.
• Practice builds mole calculation skills.