3. Gary is working on a physics problem in which 100.0 g of water undergoes a phase transition from water to vapour. He comes up with the following answer for the amount of energy in the transition: (0.100 kg)(2.3 x 10° )(100.0°C) = 2.3x 10 J Is Gary's answer correct? If so, explain. If not, what mistake did Gary make?

8. The average energy of a mole of Einstein solid is given by: ӨЕ 3R0E Ē = 3R + 2 ӨЕ ет — 1 where E is the Einstein temperature and R the gas constant. Obtain expressions for the average energy at the limits of zero and infinite temperature and comment on your results.

a. Explain what the temperature of an ideal gas actually measures, molecularly b. You have two containers, the first with 1 mole of helium and the second with 5 moles of neon at the same temperature. Which gas has more thermal energy? Explain.

When a cooked chicken breast is first removed from an oven, it has a surface temperature of 180 C. By the time the chicken is served at the table it has cooled to 120 C. What is the ratio of energy flux density emitted from the surface of the chicken when it has cooled to that when it was hot? Group of answer choices A. depends on mass of the chicken B. 0.20 C. 0.57 D. 0.67 E. depends on surface area of the chicken

How do I calculate L?

2.00 mol of helium and 1.00 mol of argon are separated by a very thin barrier. Initially the helium has 7500 J of thermal energy. The helium gains 2500 J of energy as the gases interact and come to thermal equilibrium by exchanging energy via collisions at the boundary. What was the initial temperature of the argon? First, what is the equilibrium temperature of the two gases? Express your answer in kelvins. ► View Available Hint(s) Tf = Submit Part B VE ΑΣΦ help What is the thermal energy of the argon at the equilibrium temperature? Express your answer with the appropriate units.

The enthalpy of 36 g of water vapor increases by 1830 J when its temperature increases from 150C to 175C. Assume that water vapor is an ideal gas. 1. What is the molar specific heat at constant pressure in SI units for water vapor? 2. By how much did the water vapor’s thermal energy increase? Express your answer with the appropriate units.

0.0042 mol of gas undergoes the process shown in (Figure 1). You may want to review (Pages 503 - 508). igure p (atm) 3 2 1 0- 0 100 2 200 300 1 of 1 V (cm³) Part B What is the initial temperature in °C? Express your answer using two significant figures. T₁ = Submit Part C Tf = What is the final temperature in °C? Express your answer using two significant figures. Submit VG ΑΣΦ Provide Feedback Request Answer ΑΣΦ Request Answer ? 11? °C

4. The density of the most common polymorph of ice is 917 kg/m³. Use the Clausius-Clapeyron relation to explain why the slope of the phase boundary between water and ice is negative. b. How much pressure would you have to put on an ice cube to make it melt at -2° C? а.