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

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Chemistry

1a) A block of an alloy of mass 33.0 g and at atemperature of 289.36 K is placed in a calorimeter containing 36.0g of ethylene glycol at 348.15 K. If the final temperature of thealloy and ethylene glycol is 306.28 K, calculate the specific heat(in J/g/K) of the metal. The specific heat of ethylene glycol is2.39 J/g/K. Express your answer to three significant figures inscientific notation.

b) A 0.0763 g sample of solid RbBr (s) is dissolved in449 mL of water in a coffee cup calorimeter. Once all of the RbBr(s) is dissolved in the water, the final temperature of thesolution is found to be 21.76°C. If the initial temperature of thewater in the calorimeter was 24.26 °C, calculate the calorimeterconstant (in J/K) for the coffee cup calorimeter.

Report your answer to three significantfigures.

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

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

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