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Energetics and Thermodynamics

Multiple choice question about entropy.

Which of the following has the least entropy? a. H20(s) b. H20(l) c. H20(g) d. Answers a and b have the same entropy e. Answers a, b, and c have the same entropy

Working with enthalpy of formation.

The reaction of 4.49 g of carbon and 9.21 g of oxygen, produced carbon dioxide, and 113.2 kJ of heat. What is the enthalpy of formation of carbon dioxide?

Specific heat - What is the mass of copper?

Copper has a specific heat of 0.382 J g-1 degrees Celsius -1. The temperature of an unknown mass of copper increases by 4.50 degrees Celsius when it absorbs 3.97 J of heat. What is the mass of copper?

Absolute entropy

Delta G sub f for Al203 = -1582 kJ/mol delta H sub f for Al203 = -1676 kJ/mol 1. Calculate absolue entropy for S for oxygen (g) if: S for Al(s) = 164 J/mol K S for Al2O3 (s) = 51.0 J/mol K 2. Calculate the heat required to raise the temperature of 35.0 g of aluminum from 800 degrees C to 2600 degrees C 3. To c

What to Include When Calculating Heat Emitted (q)

When calculating the amount of heat emitted (q): In which of these situations should you add the weight of what is added to the water, to the weight of the water itself? - 17g stick of boiled metal added to water in a calorimeter. or - 2g of NaOH added to water to measure the heat of dissolving.

Thermal Chemistry

I'm having problems understanding the ideas in the topic of thermal chemistry and would appreciate any sort of overview of the main concepts you could provide.