4. 1.500 g of benzoic acid, C0a, was burned in a bomb calorimeter with excess ox

Question

4. 1.500 g of benzoic acid, C0a, was burned in a bomb calorimeter with excess oxygen. The calorimeter has a heat capacity of 893 J°C, and the calorimeter contains 775 grams of waier the combustion reaction, the temperature increased from 22 evolved during the reaction. .50 °C to 3196 °C. Calculate the heat b) Calculate the heat evolved per mole of benzoic acid burned 5. Irom has a specific heat of 0.451 J/gC. Calculate the final temperature if 243.5 grams of iron. initially at 26.2 °C, is heated using 1455 J of heat energy.

Explanation / Answer

5) Given

Cp = 0.451 J/g.C

m = 243.5 g

Intial temp T1= 26.2 C

final Temp = T2

Energy = 1455 J = m * Cp * ( T2 - T1)

1455 J = 243.5 g * 0.451 J/g.C * ( T2 - 26.2 ) C

(T2 - 26.2 ) C = 13.25 C

final temperature T2 = 39.45 C Answer

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