The reaction of ethane gas (C2H6) with chlorine gas produces C2H5Cl as its main product (along with HCl). In addition, the reaction invariably produces a variety of other minor products, including C2H4Cl2, C2H3Cl3, and others. Naturally, the production of these minor products reduces the yield of the main product. Calculate the percent yield of C2H5Cl if the reaction of 300. g of ethane with 650. g of chlorine produced 490. g of C2H5Cl.
December 1, 2016 Thursday, December 1, 2014:06 PM Chapter 9 Page 1 Chapter 9 Page 2 •U cannot be calculated, but U can ∆ ΔU = q + w •q = heat (absorbedor releasedby the system) •w = work (done on or by the system) Chapter 9 Page 3 • Calculate the overall change in internal energy (ΔU) for a system that absorbs 188 J of heat and does 141 J of work on its surroundings. •Enthalpy is the heat content absorbed or released in a systemunder constant pressure q = ∆H p •ΔH = H – H (products) (reactants) •“+” = endothermic •“—” = exothermic
