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The average January temperature in New Orleans is 56 F. The average July temperature is 83 F. Consider a house in the city that exchanges heat with the outside in accordance with the relation dq/dt = A(To - Ti). The subscripts o and I stand for outside and inside.) A has the value 1080 BTU/(hr K). Assume that the inside temperature Ti is to be maintained at 70 F, and that electric power costs ten cents/kWh. Compute the daily average cost for
(a) Air conditioning in July if the conditioner's performance factor is 25 percent of the ideal or Carnot efficiency.
(b) Heating in January with electric resistance heaters.
(c) Heating in January with a heat pump having the same performance factor as the air conditioner.
Calculate the number of moles of solute present in each of the following solutions.
An aqueous solution of KI has a freezing point of -1.70 C and an osmotic pressure of 26.5 atm at 25.0 C. What is the density ?
A cook wants to heat 1.89 kg of water from 31.0 C to 100.0 C If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 kJ of heat per gram. (For the sake ..
Cars were timed by police radar as they passed in both directions below a bridge. Their velocities (kilometres per hour, numbers of cars in parentheses) to the east and west were as follows
A 4.78- sample of aluminum completely reacts with oxygen to form 6.67 of aluminum oxide. Use this data to calculate the mass percent composition of aluminum in aluminum oxide.
What is the freezing point of a solution prepared by dissolving 11.3g of Ca(NO3)2 in 115g of water? (The molal freezing point depression of constant water is 1.86 °C/m).
The standard molar enthalpy change for this reaction is -1.3MJ. What is the enthalpy change when 6 moles of octane are combusted?
show the acid catalyzed enamine product formation from 2-butanone and diethylamine
Understanding of chemistry basics - which of the following is not changed by the activity of an enzyme during a chemical reaction?
If a 10B nucleus absorbs a proton, the radioactive nuclide that is produced may undergo alpha decay. What nuclide is produced in the decay process?
Approach the tank slowly and carefully carrying full face mask with portable oxygen. The characteristic odor will be evident if leaking then put on the PPE.
A chemical reaction releases 58,500 J of heat into 150 g of water. Assuming no heat is lost to the surroundings
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