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Lec 02 24-8-05 - 1 2 1 1 mg 2 1 g 3 1 pg 2 Density defined...

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1 1. 1 mg 2. 1 μg 3. 1 pg 2 2. Density – defined as the amount of mass in a unit volume a. elements range: from Li d = 0.53 g/cm 3 to Os d = 22.6 g/cm 3 Notice the density has units of g/cm 3 or g/mL 1 mL = 1 cm 3 = 1 cm x 1 cm x 1 cm mass volume density = 3 b. Pr. Ex. 1.4b, BLB p 20 A student needs 15.0 g of ethanol for an experiment. If the density of ethanol is 0.789 g/mL, how many milliliters of ethanol are needed? 4 IV Uncertainty in Measurement – we’ll develop this in lecture as needed V Dimensional Analysis – (1.6 in BLB) – the subject of aridus laboratory exercise 1 5 1.28 (a) A cube of osmium metal 1.500 cm on a side has a mass of 76.31 g at 25˚C. What is the density in g/cm 3 at this temperature? Will osmium metal float on water? (Materials that are less dense than water will float.) (b) The density of titanium metal is 4.51 g/cm 3 . What mass of titanium displaces 65.8 mL of water at 25˚C? (c) The density of benzene at 15˚C is 0.8787 g/cm 3 . Calculate the mass of 0.1500 L of benzene at this temperature?
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