1. The following information is given for aluminum at 1atm: A 46.90 g sample of

Question

1.

The following information is given for aluminum at 1atm:

A 46.90 g sample of liquid aluminum at 977.0 °C is poured into a mold and allowed to cool to 22.0 °C. How many kJ of energy are released in this process. Report the answer as a positive number.

2.

The following information is given for copper at 1atm:

A 42.50 g sample of solid copper is initially at 1.054×103 ° C. If 1.187×104J of heat are added to the sample at constant pressure (P = 1 atm), which of the following are true.

Choose all that apply:

The sample is a solid in equilibrium with liquid.

The sample is a liquid.

The sample is at a temperature greater than 1.083×103 °C.

The sample is a solid.

The sample is at a temperature of 1.083×103 °C.

3.
The following information is given for ethanol at 1 atm:

A 45.70 g sample of liquid ethanol is initially at -5.70 °C. If the sample is heated at constant pressure (P = 1 atm),  kJ of energy are needed to raise the temperature of the sample to 106.70 °C

boiling point = 2.467×103 °C Hvap(2.467×103 °C) = 1.053×104 J/g melting point = 660.0 °C Hfus(660.0 °C) = 398.4 J/g specific heat solid = 0.9000 J/g°C specific heat liquid = 1.088 J/g°C

Explanation / Answer

Thus, amount of heat released is 61.79 kJ.

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