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SS2 First Term Chemistry Lesson Note – Stoichiometry

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WEEK 5

TOPIC: STOICHIOMETRY

  • I. Unit of quantities: length, mass volume etc.
  • Basic concepts: mole, molar quantities, molality, standard temperature and pressure (s.t.p.)
  • Calculations involving mass and volume
  • More calculations on mass and volume relationship.

PERIOD 1:  S.I. UNIT OF QUANTITIES: LENGTH, MASS VOLUME ETC

S.I. UNITS OF QUANTITIES.

S.I.  unit means international system [used to describe units of measurements from French ‘system international’] S.I. units

For example

QUANTITY SYMBOL UNITS
Length L m, cm
Mass M g or kg
Molar mass M gmol-1
Volume V cm3, dm3
Amount N mol
Molar concentration L mol.dm-3
Mass concentration P gdm-3
Avogadro’s law L mol-1
Avogadro’s number N ——
N.B molar mass M g.mol-1

Relationship between quantities

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