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Additional resources for Elements of physical chemistry, 5th Edition
5 A representation of the meaning of mole fraction. In each case, a small square represents one molecule of A (yellow squares) or B (green squares). There are 48 squares in each sample. 7) where xJ is the mole fraction of the gas J in the mixture. The mole fraction of J is the amount of J molecules expressed as a fraction of the total amount of molecules in the mixture. 009] For a mixture of perfect gases, we can identify the partial pressure of J with the contribution that J makes to the total pressure.
5 mol CO2(g) varies with volume as it is compressed at (a) 273 K, (b) 373 K from 30 dm3 to 15 dm3. Hint : To solve this and other interActivities, use either mathematical software or the Living graphs from the text’s web site. A note on good practice It is generally the case that a pro- and the curves predicted by Boyle’s law. Each curve is called an isotherm because it depicts the variation of a property (in this case, the pressure) at a single constant temperature. It is hard, from this graph, to judge how well Boyle’s law is obeyed.
In general, molar quantities are denoted Xm, where X is the property of interest. Thus, the molar volume of a substance is denoted Vm and calculated from Vm = V/n. Molar quantities are intensive properties. A note on good practice Distinguish a molar quantity, such as the molar volume, with units of cubic metres per mole (m3 mol−1), from the quantity for 1 mole, such as the volume occupied by 1 mole of the substance, with units cubic metres (m3). 79 mol C. 0 g of water? 555 mol H2O] There are three measures of concentration commonly used to describe the composition of mixtures.