What amount of heat should be imparted to 60 grammes of oxygen (O2) to heat it by 400 C at a constant pressure? A) 4180 J B) 1180 J C) 2180 J D) 3180 J
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8. |
What amount of heat should be imparted to 60 grammes of
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A) 4180 J |
B) 1180 J
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C) 2180 J |
D) 3180 J
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- 8. You drop 182 g of ice at 0°C into a glass containing 431 ml of water at a temperature of 28°C. How many grams of ice will be remaining once the temperature has attained a steady-state (i.e. once it has stopped changing)? Ignore the effects of the glass. Quantity Specific Heat Capacity of Liquid Water 4190 J/kg/°C Specific Heat Capacity of Ice Value 2100 J/kg/°C 334 x 10 J/kg 1 g/ml Latent Heat of Fusion of Water Density of Liquid Water About 31 g About 151 g About 34 g About 65 g About 249 g4) 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?1. A rigid vessel contains 5kg of wet steam (water) at 0.4 MPa. After the addition of 9585 kJ of heat, the steam has a pressure of 2.0 MPa and a temperature of 700°C Determine (a) the initial quality, (b) internal energy, and (c) specific volume of the steam.
- How much heat is required to raise the temperature of a 225 g lead ball from 15 °C to 25 °C? The specific heat of lead is 128 J/kg · °C. O A) 432 J B) 720 J C) 288 J D) 1152 J1.- In a laboratory experiment, a calorimeter is used to determine the specific heat of iron. 80 g of dry iron pellets are placed in the cup and heated to 95°C. The mass of the inner aluminum cup with a stirrer made of the same material is 60 g. The calorimeter is partially filled with 150 g of water at 18°C.The hot pellets quickly expired in the cup and the calorimeter was sealed, as shown in Figure 17.5. After the system has reached thermal equilibrium, the final temperature is 22°C. Calculate the specific heat of iron HEAT SPECIFIC Iron: 470 J/kgC: 0.113 cal/gCAluminum: 920 J/kgC: 0.22 cal/gC27
- 9) The nutritional information on a cereal box shows that one serving of a dry cereal has 200 kilocalories. If one were to burn one serving of the cereal, the amount of heat given off would be sufficient to raise the temperature of 20 kg of water how many degrees Celsius? A) 0.2°C B) 1.0°C C) 2.0°C D) 10.0°C E) 20.0°C Answer: D Topic: Concept 3.2 Skill: Application/Analysis26) A 45.0-kg sample of ice is at 0.00° C. How much heat is needed to melt it? For water LF = 334,000 J/kg and Ly=2.256 x 106 J/kg. A) 0.00 kJ B) 1.02 x 105 kJ C) 1.50 × 104 kJ D) 4.10 x 106 kJYou are given 3.74 x 10 g of coffee (same specific heat as water) at 83.6°C. In order to cool this to 60.2°C, how much ice (at 0.0°C) must be added? Neglect heat content of the cup and heat exchanges with the surroundings. mice