Chemistry 151 Chapter 8 Worksheet Fall 2015 Name 1. Calculate E and determine wh

Question

Chemistry 151 Chapter 8 Worksheet Fall 2015 Name 1. Calculate E and determine whether the process is endothermic or exothermic for the following cases a. 0.763 kJ and w--840J b. A system releases 66.1 kJ of heat to its surroundings while the surroundings do 44.0 kJ of work on the system. 2. Consider the following reaction a. Is this reaction exothermic or endothermic? b. Calculated the amount of heat transferred when 3.55 g Mg (s) reacts at constant pressure c. How many grams of MgO are produced during an enthalpy change of -234 kJ? Use Hess's law and the following data to determine AH for the reaction: C1140 + 6Fdg) Given the following data 3. 2CFdg) + 411F(g)

Explanation / Answer

4) heat liberated(q) = m*s*DT

                     = 106.5*4.18*(37.8-21.6)

                     = 7.211 kj

no of mol of NaOH = 6.5/40 = 0.1625 mol

DH0rxn = -q/n

       = -7.211/0.1625

       = -44.375 kj/mol

5) a. 2CH3OH(l) + 3O2(g) ----> 2CO2(g) + 4H2O(g)

b.   DH0rxn = (4*DH0f,H2O(g) + 2*DH0f,co2) - (2*DH0f,CH3OH + 3*DH0f,O2)

         = (4*-241.83 + 2*-393.5) - (2*-238.7 + 3*0)

         = -1276.92 Kj

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