CHM1045 Lecture 3 Outline of Last Lecture I Comparison of Temperature II Scientific Notation III Addition Subtraction IV Multiply Division V Significant Figures VI Subtraction Addition of Significant VII Multiplication Division of Significant VIII Exact Numbers Outline of Current Lecture I Dimensional Analysis Method of Solving Problems Current Lecture Dimensional Analysis Method of Solving Problems 1 Determine which unit conversion factor s are needed 2 Carry units to the calculation 3 If all units canceled except for the desired units then the problem was solved correctly Given unit desired unit desired unit Given unit EX 1 A person s average daily intake of glucose a form of sugar is 0 0833 pound lb What is this mass in milligrams mg 1 lb 453 6 g 0833lb 453 6 g 1000mg 3 78 10 4 mg 1 lb g EX 2 An average adult has 5 2 L of blood What is the volume of blood in m 3 5 2L 1dm 3 1 3M 3 5 2 1 3 5 2 10 3 m 3 1L 10 3 dm 3 10 3 EX 3 Liquid nitrogen is obtained from liquefied air and is used to prepare frozen goods and in low temperature research The density of the liquid at its boiling point 196 C or 77 K is 0 808 g cm3 Convert the density to units of kg m3 808g 1 kg 100 3cm 3 1 cm 3 1000g 1m 3 808kg 1000m 3 808 kg m 3
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