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Thermochemistry Problems

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Ethyl chloride (C2H5Cl), a substance used as a topical anesthetic, is prepared by reaction of ethylene with hydrogen chloride: C2H4(g)+HCl(g)→C2H5Cl(g) ΔH∘ = -72.3 kJ. 1. How much PV work is done (in kilojoules), if 90.0g of ethylene and 130g of HCl are allowed to react at atmospheric... 顯示更多 Ethyl chloride (C2H5Cl), a substance used as a topical anesthetic, is prepared by reaction of ethylene with hydrogen chloride: C2H4(g)+HCl(g)→C2H5Cl(g) ΔH∘ = -72.3 kJ. 1. How much PV work is done (in kilojoules), if 90.0g of ethylene and 130g of HCl are allowed to react at atmospheric pressure and the volume change is -71.9L ? 2. What is the value of ΔE (in kilojoules) for the reaction?

最佳解答:

1. w = -∫P?V = -P?V = -(101.325 kPa)(71.9/1000)m3 = 7.29kJ 2. no. of mole of 90.0g of ethylene = 90/(12x2+1x5+35.5) = 1.40 no. of mole of 130g HCl = 130/(1+35.5) = 3.56 ΔE = 7.29/1.4 = 5.2 kJ/mol 2013-10-24 17:32:01 補充： Since there is volume contraction. The PV work done is to the system. Energy of the system increases. So, w>0 and ΔE>0 2013-10-25 01:47:38 補充： Sorry! ?H=?E+P (?V) -72.3 kJ = ?E - 5.2 ?E = -67.1 kJ

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