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Design a domestic heating system that uses a heat pump to extract heat from the earth to heat a house. The evaporator is to be made of long lengths of plastic pipe buried below the frost line at a constant temperature of 50.0°F. The heat pump system must provide 200. × 103 Btu/h to the house at 70.0°F.
Specify the refrigerant; the length, diameter, and type of plastic to be used for the evaporator piping; the mass flow rate of the refrigerant; and the compressor efficiency. Also determine the pumping losses (i.e., the pressure drop) in the evaporator.
Estimate or compute an appropriate temperature differential between the outside and the inside of the condenser and the evaporator.
Why don't we observe the deBroglie wavelength of everyday macroscopic objects (such as a moving car or a thrown baseball)? The wavelength is too small relative to the size of macroscopic objects to be observed.
how many joules are required to heat 2 l of water in a pot from 20 degree c to the boiling point of water? the specific
What is the fate of acetyl CoA in the mitochondria in the presence of the following? (a) high ADP levels? (b) high NADH/NAD+ ratio? (c) low levels of oxaloacetate
A 400ml sample of gas at 10 degrees celsius is warmed to 25 degrees celcius at a constant pressure. Calculate the final volume.
Calculate the mass percent of a solution that is prepared by adding 32.2 g of NaOH to 262 g of H2O.
What is the molecularity of the following elementary reaction? NH2Cl(aq) + OH¯(aq) -> NHCl¯(aq) + H2O(l)
The rate of a reaction increases with increasing concentrations of reactants because you have more collisions occurring in a given time period. The rate of a chemical reaction is inversely proportional to the temperature.
Calculate the specific rotation of the compound. A sample of 150 mg of an organic compound is dissolved in 7.5 ml of water. The solution is paced in a 20-cm polarimeter tube and the rotation measured in a polarimeter
If 13.75 mL of 0.010 M H2SO4 was used to react with all of the OH- in the 100mL solution, what was the concentration of hydroxide ions dissolved in the 100 mL solution
5-hydroxypental gives a sixmemebered ring hemiacetal. Write a mechanism for the formation of the hemiacetal catalyzed by sulfuric acid.
Why does the tertiary amine -TRIETHYLAMINE have a much lower boiling point than 1-hexanamine, (its primary amine isomer)?
In a solution of dopamine, the density is 1.039 g/mL, experiments show that there is 1.39 mmol dopamine. How many grams of dopamine in the sample. The chemical formula of dopamine is C8H11NO2.
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