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A tank of 0.1-m3 volume contains air at 25oC and 101.33 kPa. The tank is connected to a compressed-air line which supplies air at the constant conditions of 45oC and 1,500 kPa. A valve in the line is cracked so that air flows slowly into the tank until the pressure equals the line pressure. If the process occurs slowly enough that the temperature in the tank remains at 25oC, how much heat is lost from the tank? Assume air to be an ideal gas for which CP = (7/2) R and CV = (5/2) R
Problem- A metal whose threshold frequency is 6.71 * 10^14 s^-1 emits an electron with a velocity of 6.95 * 10^5 m/s when radiation of 1.01 * 10^15 s^-1 strikes the metal. Use these data to calculate the mass of the electron
a 2.00 kg sample of pure water at 20.0 degree celsius absorbs 3.53 kJ of heat. What is the final temperature of the water?
A flask contains 0.180 of liquid bromine br2, . Determine the number of bromine molecules present in the flask.
a solution is made by taking 100.0 ml of 2.0x10-2 molarnaoh and mixing in 50.0 ml of 3.0x10-2 molar hcl. the acidityof
2.50 mol NOCl was placed in a 2.50 L reaction vessel at 400deg C. after equilibrium was established, it was found that 28 percent of the NOCl had dissociated according to the equation
What is the purpose of a hot filtration in a recrystallization. When would a hot filtration step not be necessary or useful in a purification by recrystallization? What experimental observation of the hot solution would let you know that it was no..
of 3M sodium acetate and water would you use to make 10ml of a 0.25M solution of sodium acetate? Show the calculations.
How many mL of 16 M NH3 are needed to prepare 2.00 L of a 2.00 M solution? 2. How much NaCl is present in 25.0 mL of a 12.0% (w/v) solution
A rigid tank contains 1.50 moles of an ideal gas. Determine the number of moles of gas that nust be withdrawn from the tank to lower the pressure of gas from 25atm to 35 atm.
Problem- Calculate the temperature at which delta G = 0 for the following process. Also indicate whether the process will be spontaneous at above or below that temperature.
The mass of the displaced fluid is equal to the mass of the object in air, 50.0 g, minus the apparent mass of the object in the fluid, 5.6 g: What is the mass of the displaced water
Naturally occurring iodine has an atomic mass of 126.9045. A 12.3849- sample of iodine is accidentally contaminated with 1.00070 of , a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland.
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