Problems 7-9
Problem #7
The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done?
Problem #8
Two sauce pans are on identical stove elements. One pan has 1 kg of water at 0 °C while the other has a mixture of ice and water at 0 °C with a total mass of 1 kg. Will one take longer than the other to bring to a boil? Why or why not?
Problem #9
When the pressure on a 1 kg liquid is increased isothermally from 1 bar to 3000 bar the Gibbs free energy increases by 360 kJ. Estimate the density of the liquid.