Question9 -16 0.6153 g C8H180) was burned in a bomb calorimeter. The water\'s fi

Question

Question9 -16 0.6153 g C8H180) was burned in a bomb calorimeter. The water's final temperature was 24.0 oC. The heat capacity of the calorimeter is 103 J/oC What was initial temperature? C8H180) 25/2 02(g)> 8C02(8)9 H200) 4Hrn112.4 ky mol n 16.6 oc 2) 46.9 oc 3) 9.82 o0 4) 7.60 oC ? 8.21 oC 6) 23.9 oC ? 18.1 oC 20.2 oC -1 6 Question 10 136 mL of 0.480 M HCI solution is mixed with 136 mL of 0.240 M Ba(OH)2 solution in a coffee cup calorimeter of negligible heat capacity. The initial temperature of the two solutions are both at 20.0 degrees C. What is the final temperature of the water? s of H20 -4.184 J/goC d of solution is 1.00g/mL. Refer to the following Ba(OH)2 + 2 HCI ..> BaCl2 + 2H2? &Hrxn;=-112.4kj/mol rxn 35.00C 2) 16.9 oC 28.9 oc

Explanation / Answer

Molar mass of C8H18 = 12 * 8 + 18 * 1 = 114 gm/mol

Number of moles of C8H18 = mass/molar mass = 0.6153/114 = 0.00539736842 moles

Heat Released to the system = number of moles * Delta H(rxn)

=>  0.00539736842 * 112.4

=> 606.664 J

Heat capacity of calorimeter * Change in Temperature = 606.664

103 * Change in Temperature = 606.664

Change in Temperature = 5.89

Initial Temperature = 24 - 5.89 = 18.1C

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