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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