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Suppose one mole of superheated water is evaporated at 383 K and 101 kPa. Compute DS of the water and of the surroundings, DHv(373 K) = 47.3 kJ mol-1, Cp(H2O,l) = 75.4 J K-1 mol-1, and Cp(H2O,g) = 30.36 + 9.61x10-3T + 11.8x10-7T2 (J K-1 mol-1). Explain what is DS of the universe?
In a typical mass spectrum, a smaller signal is observed at a mass 1 amu higher than the molecular ion peak. Why? A) Due to small impurities in the sample
the half-life of tritium 31h is 12.3 years. if 47.0 mg of tritium is released from a nuclear power plant during the
It took 3.66 min with a current of 2.28 A to plate out all the silver from 0.210 L of a solution containing Ag+. What was the original concentration of Ag+ in the solution
A compound is known to contain 51.27% carbon and 27.30% oxygen by mass. Each molecule contains two atoms of oxygen. What is the molar mass of this substance
Calculate the pH of a solution containing 1.5 M acetic acid and 0.25 M sodium acetate. For acetic acid, Ka = 1.8 x 10-5. either as a buffer system or use ICE table. NaOAc is a strong electrolyte
The final partial pressure of NOBr was 2.5 atm after the following equilibrium was established: 2NOBr(g) 2NO(g) + Br2(g). What is the value of Kp
A particular application calls for N2 (g) with a density of 1.80 g/L at 32°C. What must be the pressure of N2 (g) in millimeters in mercury? What is the molar volume under these conditions
Suppose that a 2.00-L metal bottle that contains air at 113K and 2.5 atm pressure is sealed off. If we inject 60.0 mL of liquid helium and allow the entire system to warm to room temperature (25°C), what is the pressure inside the bottle?
what is the chemical formula of a homonuclear diatomic ga if it has a pressure of 1.40 atm and a density of 1.82 gl at
if our eyes could see a slightly wider region of the electromagnetic spectrum we would see a fifth line in the balmer
Precipitation reactions. "WE put 50 mg of PbCl2 in 100 ml of water at 25 degrees Celcius. What is the chloride ion concentration of the solution. (Ksp of PbCl2 =1.7 x 10^(-5)
diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2°. What is the distance between the layers of atoms responsible for the diffraction?
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