Worksheet1_DimAnalysisandSigFig

Worksheet1_DimAnalysisandSigFig - Chem142,Autumn2011

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Unformatted text preview: Chem142,Autumn2011 Name______________________ 1. A.Howmanysignificantfiguresareineachofthefollowingnumbers? 5.40 ________ 3.97x105 ________ 30000 ________ 250. ________ 1.4895 ________ 1.400 ________ 235.40 ________ B.Completethefollowingcalculationstotheappropriatenumberofsig.figs.: 234.52 +25.2= 1420x320.= (6.274x103)x(1.56x102) = 5291.30= 430.44.67= (1.343x102)+(1.5654x102) = Group Activity 1: Significant Figures, Units, and Conversion Factors 1of4 Chem142,Autumn2011 2. Theaveragespeed(urms)ofacollectionofgaseousmoleculesisgivenbythe followingformula: whereTisthetemperatureofthesample,Misthemolarmassofthegaseous compound,andRisaconstantrelatedtothedistributionoftheavailablekinetic energyoverthemoleculesinthesample(R=8.314Jmol1K1).Whatisurmsfor nitrogengasat25oC? 2of4 Chem142,Autumn2011 3. Methanol(methylalcoholorwoodalcohol)isapotentialautomotivefuel,eitherin pureformormixedwithgasoline.Somefleetvehicles,suchasmunicipalbuses,have beenmodifiedtoburnmethanolcontainingfuels.Thesefuelsarealsousedbysome racecars.Aparticularautomobilemodifiedtouseamixtureof85.0%methanoland 15.0%gasolinebymassgets25.5mi/gal.Thefuelhasadensityof0.775g/mL.How manykilogramsofmethanoldoestheautomobileconsumeinatripof808km? 3of4 Chem142,Autumn2011 Potentially helpful information. Conversion factors: Length 1m=1.094yd 1mi=5280ft 1ft=12in 3 1km=10 m 1mi=1760yd 1 =1010m 1m=102cm(centimeters) 1in=2.54cm (exact) 3 1m=10 mm(millimeters) Mass 1kg=2.205lb 1lb=453.6g 1amu=1.6605x1027kg 1oz(ounce)=28.35g Volume 1L=1000mL=1.06qt 1ft3=28.32L 3 1mL=1cm =0.03381oz 1gal=3.785412L=4qt Pressure 1atm=760.mmHg 1torr=1mmHg 2 1atm=14.6959lb/in (psi) 1atm=101,325Pa 2 1Pa=1N/m 1bar=100kPa Energy 1eV=1.602x1019J 1cal=4.184J(exact) Force 1N=0.22481lb Compound Units: Newton(N):1N=1kg.m/s2 Joule(J):1J=1N.m=kg.m2/s2 Metric prefixes: kilo(k)=103mega(M)=106giga(G)=109tera(T)=1012peta(P)=1015 centi(c)=102micro()=106nano(n)=109pico(p)=1012femto(f)=1015 Physical Constants: massofelectron 0.000549amu massofproton 1.00728amu massofneutron 1.00867amu Avogadro'sNumber(NA) 6.0221367x1023 speedoflight 2.99792x108m/s accelerationduetogravity 9.80665m/s2 4of4 ...
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