week3key - Chemistry 114 Week 3 Worksheet Spring 2008...

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Chemistry 114 Week 3 Worksheet Spring 2008 Please note that I have not had time to double-check these calculated answers. Let me know of any mistakes found. – Dr. Balch 1. For each process, state whether Δ H is less than (more negative), equal to, or greater than Δ E of the system. Explain your answer in each case. a. An ideal gas is cooled at constant pressure. b. A mixture of gases undergoes an exothermic reaction in a container of fixed volume and the number of moles of gas present during the reaction does not change. c. A solid yields a mixture of gases in an exothermic reaction that takes place in an open container. 2. A balloon is inflated from a volume of 0.100 L to 1.85 L in a children’s classroom (so at typical atmospheric pressure). Calculate w for the balloon and w for the surroundings. [-177 J] 3. Calculate Δ H rxn for CH 4 ( g ) + 4 Cl 2 ( g ) CCl 4 (g) + 4 HCl( g ) given C( s ) + 2 H 2 ( g ) CH 4 ( g ) Δ H = -74.6 kJ C( s ) + 2 Cl 2 ( g ) CCl 4 ( g ) Δ H = -95.7 kJ H 2 ( g ) + Cl 2 ( g ) 2 HCl( g ) Δ H = -92.3 kJ [-205.7 kJ] 4. Calculate Δ H ˚ rxn
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