Question 1: (1 point) 1a)A 0.003525-mol sample of an organic compound was burned

Question

Question 1: (1 point)


1a)A 0.003525-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 24.5oC to 26.7oC. If the heat capacity of the calorimeter is 4.46 kJ (oC)-1, then what is the constant volume heat of combustion of this compound, in kilojoules per mole? (Remember to include a "+" or "-" sign in your answer, as appropriate.)

Enter your answer with 3 significant figures.


1b)Brass has a density of 8.40 g/cm3 and a specific heat of 0.385 J g-1 oC-1. A 11.2 cm3 piece of brass at an initial temperature of 154oC is dropped into an insulated container with 138.4 grams of water initially at 24.1oC. What will be the final temperature of the brass-water mixture? (The specific heat of water is 4.184 J g-1 oC-1.)

Enter your answer with 3 significant figures. Enter only numbers in your answer. (Do not include units.)

Explanation / Answer

1a) - 52.3 kJ 1b) -200.12 kJ

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