Question

25. A 8,2 g sample of propane, C3H8, is burned inside a bomb calorimeter containing 2500 g of water initially at 20.6 °C. Calculate the final temperature of the bomb calorimeter system if AH comb for propane is -103.9 kJ/mol and the heat capacity of the bomb calorimeter is 2.25 kJ/°C. 1) 34.16°C 2) 22.12°C 3) 19.08°C 4) 17.61°C

Answer 1

The heat granted by combustion is calculated:

q comb = 8.2 g * (1 mol / 44.1 g) * (103.9 kJ / 1 mol) = 19.32 kJ

It has the heat expression for the calorimeter:

q = m * cp * ΔT + Ccal * ΔT

19320 = 2500 * 4.18 * (Tf - 20.6) + 2250 J * (Tf - 20.6)

Tf clears = 22.12 ° C

Option 2.

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