Molecular Physics | Thermodynamics Answers

One mole of a monatomic perfect gas initially at temperature T expands from volume V to 2V, (a) at constant temperature, (b) at constant pressure. Calculate the work of expansion and the heat absorbed by the gas in each case? (5marks)

How much heat is required to change 200ml of ice at - 22°C(at typical freezer temperature) into steam? (10 marks)

What is the maximum wavelength of electromagnetic radiation that can eject photoelectrons from a metal with work function of 3.9 eV?

) A 3.65-mol sample of an ideal diatomic gas expands adiabatically from a volume of 0.1210 m3 to 0.750 m3. Initially the pressure was 1.00 atm. Determine: (a) the initial and final temperatures; (b) the change in internal energy; (c) the heat lost by the gas; (d) the work done on the gas. (Assume no molecular vibration.)

To raise the temperature of 5 kg of water from 20 0C to 30 0C, a 2-kg iron bar is heated and then dropped into the water. What should the temperature of the bar be

Heat is supplied to an engine at the rate of 10^(6)J minute ^(-1) and the engine has an output of 10 horsepower.What is the efficiency of the engine and what is the heat output per minute?

An aluminum block (c = 9.1 X 10² J/kg K) of mass 0.50 kg at a temperature of 155 degrees Celsius is dropped into an aluminum calorimeter cup of mass.200 kg containing 1.00 kg of water ( c = 4.2 X 10³ J/kg K) at 20 degrees Celsius. The system is insulated and attains equilibrium at a final temperature T_f

(I) Using the definition of specific heat capacity, set up the Q_total = 0 equation.

(II) solve for T_f

Calculate the temperature of a fluid when both Fahrenheit and a Celsius thermometer are immersed in it, under the following conditions (a) the numerical reading is identical in both thermometers, (b) the Fahrenheit is numerically twice that of the Celsius reading. Express the values in ⁰R and ⁰K.

Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmospheric pressure is 100 kPa and point has a mass of 50 kg and a face area of 0.1 m². Electric current passes through the resistor, and the volume of of air slowly increases by 0.045 m³. The mass of the air is 0.3 kg, and its specific energy increases by 42.2 kJ/kg. Assume the assembly ( including the piston) is insulated and neglect the friction between the cylinder and piston, g = 9.8 m/s². Determine the heat transfer from the resistor to air for a system consisting of (a) the balloon, (b) the air and the piston

1. How much heat is required 200 mL of ice at - 22 degrees Celsius (at typical Freezer temperature).
2. One mole of a monoatomic perfect gas initially at temperature T₀ expands From volume V₀ to 2V₀ (a) at constant temperature, (b) at constant pressure. Calculate the work of expansion and the heat absorbed by the gas in each case.
3. Determine the mass and specific volume of argon gas in a vessel at 150 kPa and 20 degrees Celsius. The vessel is spherical and has a radius of 5m.
4. A container which has a volume 0.1 m³ is fitted with plunger enclosing 0.5 kg of steam at 0.4 MPa. Calculate the amount of heat transferred and the work done when the steam is heated to 300 degrees Celsius at constant pressure.