2.3: Solve simple quantitative chemical problems
Introduction
Quantative chemistry is the study of 'how much'.
This unit is designed to prepare you for NCEA level 2 Achievement standard 90763: Solve simple quantitative chemical problems.
Before we start we need to remind ourselves of some definitions.
Scientific notation or standard form:
Significant figures:
Outcomes
By the end of this unit you should be able to:
- Calculate the molar masses of molecules from given molar masses of atoms and formulae.
- Calculate mole ratios from given molar masses of atoms and their formulae.
- Carry out calculations using the formulae: [math]n = \frac{m}{M}[/math] and [math] n = v \times c[/math]
- Calculate the percentage composition of a compound
- Determine the empirical and molecular formula of a compound.
- Calculate the number of water molecules in the formula of a hydrated salt.
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Preknowledge
It is useful to be able to write balanced equations
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