4 and 5 please :) Is this refrigerator possible? Why or why not? In a calorimetr

Question

4 and 5 please :)

Is this refrigerator possible? Why or why not? In a calorimetry experiment, 220 g of a metal 99.0 degree C were added to 150 g of water at 20.0 degree C and the combination reached an equilibrium temperature of 33.2 degree C. the specific heat of the metal? Let's say a house consists of 10 single-pane, thick glass windows, each 1.5 m^2 in area. If the inside of the 22 degree C and the outside is -15.0 degree C, what is the rate of heat loss of through the house windows? One mole of N_2 gas at 22 degree C and 1 atm. What is the volume of the gas? What is the "average" speed of gas molecules? What is the total thermal energy of the gas?

Explanation / Answer

Thermal conductivity of glass window= 0.96 W/m.K

Area of 10 windows = 10*1.5= 15m2

Heat loss = K*deltaT*A/dx

Assuming unit thickness, heat loss= 0.96*15*(22+15) W=533 W

2.

2. Volume of gas, nRT/P= 1*0.0821*(22+273) L=24.22 L

Average speed = sqrt(3RT/M), M= Molar mass =28/1000 =0.028 kg/mole

R= 8.314 J/mole.K, T= 295 K, average speed = sqrt(3*8.314*295/0.028)=512.6 m/s

Thermal energy =(3/2)KT, K= Boltzmann constant = 1.38*10-23 J/K

Thermal energy = 1.5*1.38*10-23*295=6.1*10-21 Joules

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