oC to 60.oC.c) Raising the temperature of the container from -73oC to 127oC.d) Adding 28 g nitrogen gas (inert gas).G.4 An ideal gas at 7oC is in a spherical flexible container having a radius of 1.00 cm. The gas isheated at constant pressure to 88oC. Determine the radius of the spherical container after thegas is heated.G.5 Concentrated hydrogen peroxide solutions are explosively decomposed by traces of transition metal ions (such as Mn or Fe): 2H2O2(aq) à2H2O(l) + O2(g)What volume of pure O2(g) collected at 27oC and 746 Torr, would be generated bydecomposition of 125 g of 50.0% by mass hydrogen peroxide solution? Ignore any water vaporthat may be present.G.6 A 100. L flask contains a mixture of methane (CH4) and argon gases at 25oC. The mass ofargon present is 228 g and the mole fraction of methane in the mixture is 0.650. Calculate thetotal kinetic energy of the gaseous mixture.G.7 The average lung capacity of a human is 6.0 L. How many moles of air are in your lungs when you are in the following situations? a) At sea level (T=298K, P=1.00 atm) b) 10. M below water (T=298, P=1.97 atm) c) At the top of Mount Everest (T=200. K, P=0.296 atm) G.8 In the “Methode Champenoise,” grape juice is fermented in a wine bottle to producesparkling wine. The reaction isC6H12O6(aq)à2C2H5OH(aq) + 2CO2(g)Fermentation of 750. mL grape juice (density = 1.0 g/cm3) is allowed to take place in abottle with a total volume of 825 mL until 12% by volume is ethanol (C2H5OH). Assumingthat the CO2is insoluble in H2O (actually a wrong assumption), what would be the pressureof CO2inside the wine bottle at 25oC? (The density of ethanol is 0.79 g/cm3.)
Gas Law ProblemsG.9 A compound contains only C, H, and N. It is 58.51% C and 7.37% H by mass. Heliumeffuses through a porous frit 3.20 times as fast as the compound does. Determine theempirical and molecular formulas of this compound.
CHEM 105Solutions Practice ProblemsSolutions and solution stoichiometryS.1In a 1-L beaker, 203 mL of 0.307 M ammonium chromate ((NH4)2CrO4) was mixed with137 mL of 0.269 M chromium(III) nitrate (Cr(NO2)3) to produce ammonium nitrate andchromium(III) chromate. Write the balanced chemical reaction occurring here. If thepercent yield of the reaction was 88.0%, what mass of chromium(III) chromate wasisolated? (apply)S.2The unknown acid H2X can be neutralized completely by OH-(aq) according to thefollowing (unbalanced) reaction:H2X(aq) + HO-(aq)àX2-(aq) + H2O(l).The ion formed as a product, X2-(aq), was shown to have 36 total electrons. What is elementX? To completely neutralize a sample of H2X, 35.6 mL of 0.175 M OH-(aq) solution wasrequired. What was the mass of the H2X sample used? (analyze)
CHEM 105Exam 2Fall 2016Please rip this page of and use throughout the exam when time starts.Constants and equations:Speed of light: c = 2.997x108ms-1Plank’s constant: h=6.626x10-34J·s1 J = 1 kg·m2·s-2charge of an e-: e = 1.602x10-19Cmass of e-: me=9.11x10-31kgmass of p+: mp=1.67x10-27kg࠵?=ℎ∙࠵?Avogadro’s constant: NA= 6.022x1023mol-1DeBroglie Relation:࠵?=!
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