s11q10Key - 1. Chem 171 Quiz 10 Version A (Key Enthalpy...

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Chem 171 Quiz 10 Version A (Key Enthalpy CO 2 ) 1. Does the figure depict an endothermic or an exothermic reaction? Why? Endothermic reaction Heat is absorbed or the potential energy of the products is larger than that of the reactants or Δ H is positive 2. To apply a green chemistry approach, a chemical engineer uses waste CO 2 from a manufacturing process, instead of chlorofluorocarbons, as a “blowing agent” in the production of polystyrene containers. Find the density (in g/L) of CO 2 at STP (0 0 C and 1 atm). CO 2 = 44.01. R = 0.0821 L atm / K mol. PV = nRT PV = nRT, PV = (m/M) RT, P = (m/VM) RT and d = M x P / RT d = 44.01 g / mol x 1 atm / 0.0821 L atm / K mol = 1.96 g / L Chem 171 Quiz 10 Version B 1. Does the figure depict an endothermic or an exothermic reaction? Why? Exothermic Heat is given off or the potential energy of the products is lower than that of the reactants or H is negative 2. An organic chemist isolates a colorless liquid from a petroleum sample. She obtains the following data: Volume of flask = 213 mL, T=100.0 0 C, P = 754 torr, Mass of flask + gas =
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s11q10Key - 1. Chem 171 Quiz 10 Version A (Key Enthalpy...

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