CHEM 1000 Lecture Notes - Silver Chloride, Joule

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A 100g coffee sample (specific heat = 0. 385 j/gc) at 100c is added to 50. 0g of water at. 26. 5c what is the final t of the mixture? (t in fahrenheit could be asked) 100g x 0. 385j/gc x (xc 100c) = -50g x 4. 184t/gc x (xc 26. 5c) Specific heat of water 4. 184 j/gc and enthalpy of fusion = 6. 02 kj/mol. Initial temp = -10c. desity of water is 1. 00 g/l. 10c q1: the heat of combustion of benzoic acid in -26. 42 kj/g. The combustion of 1. 176g sample of benzoic acid causes a temp increase of 4. 96c in bomb calorimeter. Qrxn = 1. 176g x -26. 42 kj/g = -31. 07 kj = - qcal. Aqueous silver ion reacts with aqueous chloride ion to yield a white precipitate of silver chloride. In such cases m = 20. 0 ml x 1 g/ml = 20 g. Heat evolved / mole agcl = 6. 4 x102 j / (1. 00 x 10-2 mol agcl) = -64 kj/ mol agcl.

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