Find temperature and internal energy changes across valve
Refrigerant-134a enters the expansion valve of a refrigeration system at 160psia as a saturated liquid and leaves at 30psia. Determine the temperature and internal energy changes across the valve.
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Let us model a pi-electron in a tyrosine, by assuming it is a particle trapped in a 2-dimensional square box. As you should know, the maximum of absorption is at about 280nM.
What gas escaped during the sodium bicarbonate washing? Write balanced equations for two reactions that took place during this operation.
Using the standard normal table, find the proportions for the areas listed below
If the melting point of the compound is unknown the melting point measurement could take an exceedingly long time if the rate of heating of 2C/min is followed over the entire range from room temperature to the melting.
You want to know the detergent composition of an extract of a shampoo. You spot the sample on a TLC plate and develop it in dichloromethane and observe a single spot at Rf 0.95.
Calculate the change in entropy (Btu/R) for the CO2 for the above process. Comment on whether or not process 1-2 is possible for an adiabatic system.
The land area of Greenland is 840,000 mi2 with 132,000 mi2 free of ice. The average thickness of ice is 5000 ft. The density of the ice is 0.917 g/ml. Calculate the mass of ice in tons. Please explain steps.
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