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Worksheet 1 - Chem 142 Winter 2012 Name Group Activity 1...

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Chem 142, Winter 2012 Name ______________________ 1 of 4 Group Activity 1: Significant Figures, Units, and Conversion Factors 1. A. How many significant figures are in each of the following numbers? 5.40 ________ 3.97 x 10 -5 ________ 30000 ________ 250. ________ 1.4895 ________ 1.400 ________ 235.40 ________ B. Complete the following calculations to the appropriate number of sig. figs.: 234.52 + 25.2 = 1420 x 320. = (6.274 x 10 3 ) x (1.56 x 10 -2 ) = 529 1.30 = 430. - 44.67 = (1.343 x 10 2 ) + (1.5654 x 10 2 ) =
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Chem 142, Autumn 2011 2 of 4 2. The average speed ( u rms ) of a collection of gaseous molecules is given by the following formula: M RT u rms 3 where T is the temperature of the sample, M is the molar mass of the gaseous compound, and R is a constant related to the distribution of the available kinetic energy over the molecules in the sample ( R = 8.314 J mol -1 K -1 ). What is u rms for nitrogen gas ( M = 28.02 g mol -1 ) at 298.15 K?
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Chem 142, Autumn 2011 3 of 4 3. Methanol (methyl alcohol or wood alcohol) is a potential automotive fuel, either in pure form or mixed with gasoline. Some fleet vehicles, such as municipal buses, have been modified to burn methanol-containing fuels. These fuels are also used by some race cars. A particular automobile modified to use a mixture of 85.0% methanol and
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