c) Use Hess's law to calculate the amount of heat involved in converting 25.00 g of liquid water at 25° to steam at 100°
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- Q:33)4) A ground source heat pump heats a building by extracting heat from the ground and pumping it into the building. Define: Qc = heat extracted from the ground, Qn= heat pumped into the building, W = electric energy used by the heat pump, Tc= temperature of the ground, T = temperature of building (Qc, Qn, and W are positive by definition). Assume Tr > Tc. a) Draw a diagram showing energy flow in and out of the heat pump. b) Write a general expression for the change AS in the entropy of the "universe", that is the heat pump plus the cold and hot reservoirs, in terms of the quantities defined above. Now assume ideal (reversible) operation, and take Te= 10 °C and Tp= 20 °C. What is the coefficient of performance (ČOP) of the heat pump? By what factor would this change if we had Tc = 0 °C instead?4
- A granite ball of radius 9.00 m and emissivity 0.046 is heated to 150°C. (a) Convert the given temperature to Kelvin. (Enter your answer to at least the nearest Kelvin.) K (b) What is the surface area of the ball? m2 (c) If the ambient temperature is 25.0°C, what net power does the ball radiate? W7B. A 98.2 g copper rod is cooled from 80°C to 25°C by tossing it into a very large swimming pool at 25°C. The temperature of the pool is not appreciably changed in the process. Compute ASys, ASur and ASniv- (Treat the copper rod as the system.) Some possibly useful data for Cu: C,m-24.44 J K 'mol 'univ p.mIce at -12.1 °C and steam at 121 °C are brought together at atmospheric pressure in a perfectly insulated container. After thermal equilibrium is reached, the liquid phase at 44.1 °C is present. Ignoring the container and the equilibrium vapor pressure of the liquid at 44.1 °C, find the ratio of the mass of steam to the mass of ice. The specific heat capacity of steam is 2020 J/(kg C°). af Number i Initial state Units Steam - Ice Equilibrium Water