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This 2 page Reader was uploaded by Maryna Gregulich on Sunday February 14, 2016. The Reader belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 21 views.
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Date Created: 02/14/16
Succinic Acid Calculation (Unknown) Ambient Temperature: T=23C = 296.15 K 1 1 Ideal Gas Constant = 8.31447 J K mol Combustion of the Unknown Total heat released by burning both the unknown and fuse wire: Temperature change (measured) T = 1.52 K unknown Heat Capacity of Calorimeter C cal2.350 10 J K 1 Total heat evolved qtot C cal unknown= 3.57 10 J Heat released by burning fuse wire: Initial length of the wire (measured) lini 10.0 cm Remaining wire length (measured) lleft4.3 cm Length of wire burned lburned= lini Ileft5.7 cm Heat released by burning fuse wire q = 2.3 cal cm = 962.964 J m 1 Heat released by burning l burnedwire qwire= lburned = 54.889 J O Heat evolved from combustion of SA alone: q unknown= qtot q wire= 3.517 10 J HO OH Heat of combustion of the unknown Mass of SA pellet m unknown= 0.2760 g O 1 Molecular mass of SA M unknown= 118.09 g mol Amount of SA n = m / M = 2.337 10 mol unknown unknown unknown Heat of combustion of SA: at constant volume, this is the change in internal energy U 6 c unknown= qunknown/ nunknown= 1.505 10 J This particular unknown is Succinic Acid (C H O ) 4 6 4 Succinic Acid combustion reaction: C 4 O6(s4 + 3.5 O (g)2 4 CO (g) + 2 H O(l) 2 Net amount of gas produced/consumed gas – 3.5 = 0.5 gas= 1.231 10 3 Change in enthalpy H = U + RT = 1.506 10 J mol 6 1 c unknown c unknown gas Thus , Δ H c Succinic Acidrom the experiment is Δ H c Succinic Acid 1.506 × 10 J mol 1 Experimental Error: Δ H from the literature c Succinic Acid
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