Toluene, is used in the manufacture of explosives such as TNT. A 1.50 g of tolue

Question

Toluene, is used in the manufacture of explosives such as TNT. A 1.50 g of toluene was burned in excess oxygen in a bomb calorimeter containing 1200g of water. The temperature rose from 25.00 Celsius to 36.41 Celsius. If the reaction produces 3902 kJ/mol, what is the heat capacity of the calorimeter?

C7H8 (l) + 9O2 (g)---> 7CO2 (g) + 4H2O(l)

a) 550J/°C    b) 724J/°C c) 897J/°C    d) 1250J/°C.   e)1951J/°C

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Explanation / Answer

answer : a) 550 J/ oC

mass of toulene = 1.50 g

moles of toulene = 1.50 / 92 = 0.01628 mol

delta H = - Q / n

- 3902 = - Q / 0.01628

Q = 63.52 kJ

heat Q = 63522.9 J

Q = m Cp dT + Cp dT

63522.9 = 1200 x 4.184 x (36.41 - 25) + Cp x (36.41 - 25)

Cp = 546.5

heat capacity of the calorimeter = 550 J / oC

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