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A flat plate solar collector, 6 ft by 12 ft, is mounted on the roof of a house. The outer surface of the collector is at 110 degree F and its emissivity is 0.9. The outside air is at 70 degree F and the sky has an effective temperature for radiation of 45 degree F. The collector transfers heat by natural convection to the air with a heat transfer coefficient of 3.2 Btu/h.ft2. degree F and also transfers heat by radiation to the sky. Calculate the total heat loss from the solar collector.
How many liters of hydrogen gas are formed from the complete reaction of 1.12 mol of c? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and temperature of 325 k.
Calculate the indicated quantities for a system consisting of 1 mol of N2 gas. Assume ideal gas behavior. a) The gas initially at 10 atm pressure is expaneded tenfold in volume against a constant external pressure of 1 atm, all at 298 k. Calculate ..
What is the pH of a buffer solution made with 20 g of acetic acid and 30 g of sodium acetate in 450 mL of water? (Ka = 1.8 x 10-5). If concentrated HCl is added, will the pH increase or decrease?
Given the following reaction, if 32.5 g of Cl2 reacts completely with excess P, how many g of PCl3 will be produced. 2 P + 3 Cl2 --> 2 PCl3
A researcher conducting a large-scale experiment dissolved 750.0 g of calcium chloride in a tank. The resulting solution was found to have [Cl-] = 0.026 M. If the tank was 0.75 m wide and 1.20 m long, how deep was the tank
Calculate the separation in energy between the ground state and the first excited state in which one electron occupies the state with n=7. Calculate the frequency of the radiation required to produce a transition between these two states.
The following data have been obtained for oxygen gas at 273.15K. Calculate the best value of the gas constant R from them and the best value of the molar mass of O2.
Population ratio between two energy levels is 0.98. The space between the energy level is 0.625 meV. What is the system's temperature?
Combustion analysis of an unknown compound containing only carbon and hydrogen produced 1.1385 g of CO2 and 0.5805 g of H2O. What is the empirical formula of the compound
Phosphorus-32 has a half-life of 14.0 days . Starting with 2.00 g of P^32, how many grams will remain after 70.0 days?
Assume that 29.0 mL of a 0.10 M solution of a weak base B that accepts one proton is titrated with a 0.10 M solution of the monoprotic strong acid HX.
At equilibrium 1.97e-02 mol of NOCl is found in the reaction mixture. Calculate the equilibrium pressures of all gases in the reaction vessel and the value of KP for the reaction. Pick the correct statement from the multiple choices. Use the value..
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