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In: Chemistry

1a) A block of an alloy of mass 33.0 g and at a temperature of 289.36...

1a) A block of an alloy of mass 33.0 g and at a temperature of 289.36 K is placed in a calorimeter containing 36.0 g of ethylene glycol at 348.15 K. If the final temperature of the alloy and ethylene glycol is 306.28 K, calculate the specific heat (in J/g/K) of the metal. The specific heat of ethylene glycol is 2.39 J/g/K. Express your answer to three significant figures in scientific notation.

b) A 0.0763 g sample of solid RbBr (s) is dissolved in 449 mL of water in a coffee cup calorimeter. Once all of the RbBr (s) is dissolved in the water, the final temperature of the solution is found to be 21.76°C. If the initial temperature of the water in the calorimeter was 24.26 °C, calculate the calorimeter constant (in J/K) for the coffee cup calorimeter.

Report your answer to three significant figures.

The heat of the solvation of RbBr (s) is 21.88 kJ/mol.

c) For a given chemical process, the system absorbs 338 kJ of heat and the surroundings perform 348 kJ of work on the system. What is the value of ΔU (in kJ) for the process? Report your answer to three significant figures.

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