An introduction to the basic ideas lying behind all chemistry calculations. The mole is an essential measure of the amount of a substance in chemistry. This is probably the most important page in this section. Explains how the mole concept can be used to find or confirm the formulae of compounds. Calculating the mass of product from a known mass of reactant, or how much reactant is needed to produce the amount of product you need. Avogadro's Hypothesis. The molar volume of a gas. Calculations from equations involving gases. **An introduction to calculations in equations involving solutions . . .**Introducing the various ways concentrations of solutions can be given, and some simple examples involving them. An introduction to calculations involving acids and alkalis in solution. Explains what is meant by "limiting reagent" and "atom economy" and a look at the calculations involved. The Faraday constant, and how to use it in simple electrolysis calculations Measuring the heat evolved or absorbed during reactions, and working out the enthalpy change of a reaction. Using bond energies (enthalpies) to estimate enthalpy changes of reactions.
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