CHEM 1P91 Lecture Notes - Lecture 4: Dimensional Analysis, Sodium Chloride
18 Sep 2017
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A wire is a long, narrow cylinder. 1cc = 1cm3 = 1cm x 1cm x 1cm. If a mixture is made up of substances a,b & c, then. % by mass a = mass a . x 100% The mass % of a solute = [(mass of nacl)/ sum of solution] x 100% Mass a + mass b + mass c. A method by which we solve problems in science using units as a guide. Units should always be included in calculations. Units are multiplied, divided and canceled like any other algebraic quantity. In general, to apply dimensional analysis, we use the relationship. Unit 1 x conversion factor = unit 2. The conversion factor is given by an equivalence statement. For example, 1 inch = 2. 54cm, 1lb = 2. 2kg. Multiply the conversion factors so the units cancel. Conversion factors should never affect the number of significant figures in a calculation.
