Conversion factors, inside front cover

Factors for converting from one system of units to another may be determined by taking ratios of quantities listed in the table on the inside front cover of this book. A larger table of conversion factors is given on pp. 1-4 through 1-20 of Perry s Chemical Engineers Handbook. ... 

Factors needed to convert from one force unit to another are summarized in the table on the inside front cover. The symbol is sometimes used to denote the conversion factor from natural to derived force units for example,... 

You can convert a quantity expressed in one set of units into its equivalent in other dimensionally consistent units using conversion factors, like those in the table on the inside front cover of the text. 

Using the table of conversion factors on the inside front cover, convert... 

Normally, heat, work, and kinetic and potential energy terms are determined in different units. To evaluate AH, we will convert each term to kW (kJ/s) using conversion factors given on the inside front cover, first noting that m = (500 kg/h/3600 s/h) = 0.139 kg/s. 

Of course, it is possible to look up conversion ratios, which will enable the length of the calculation to be reduced for instance, in Example 1.2 we could have used the conversion factor of 60 mi/hr equals 88 ft/s. However, it usually takes less time to use values you know than to look up shortcut conversion factors in a handbook. Common conversion ratios are listed on the inside front cover,... 

Solution The conversion factor needed to covert between moles and grams is the molar mass. In the periodic table (see inside front cover of the text), we see that the molar mass of An is 197.0 g. This can be expressed as... 

Solution According to the periodic table on the inside front cover, we see the molar mass of Zn is 65.39 g. Multiplying the number of moles in the sample by the following conversion factor... 

You need a conversion factor between grams of helium and moles, which is helium s molar mass, 4.00 g/mol. Start with the mass and convert to the number of moles. (The molar mass of helium and other elements can be obtained from the periodic table on the inside front cover of this book.)... 

U and V respectively. Systeme International (SI) units, described in Appendix B, are used extensively but not slavishly. Chemically convenient quantities such as the gram (g), cubic centimeter (cm ), and hter (L = dm =10 cm ) are still used where useful—densities in g cm , concentrations in mol L , molar masses in g. Conversions of such quantities into their SI equivalents is trivially easy. The situation with pressure is not so simple, since the SI pascal is a very awkward unit. Throughout the text, both bar and atmosphere are used. Generally bar = 10 Pa) is used when a precisely measured pressure is involved, and atmosphere = 760 Torr = 1.01325 X 10 Pa) is used to describe casually the ambient air pressure, which is usually closer to 1 atm than to 1 bar. Standard states for all chemical substances are officially defined at a pressure of 1 bar normal boiling points for liquids are still understood to refer to 1-atm values. The conversion factors given inside the front cover will help in coping with non-SI pressures. 

A short table of these conversion factors can be found inside the front cover. The American Society for Testing and Materials (ASTM) [10] has prepared a much longer and more useful table, which reveals some additional complexity. For example, there are five different calorie definitions in common use. The largest is 1.002 times the smallest. Only in the most careful work is this small a difference relevant. But if you are doing that kind of work, it is worthwhile to obtain, study, and use the tables in Ref. 10. 

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