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A solution is made by dissolving 0.745g potassium chloride in 100.0g water. The solution is observed to freeze at -0.3580C. What is the van't Hoff constant for potassium chloride
A 9.41g sample of HgCl2 is dissolved in 32.75g ethanol (C2H6O). The boiling point is elevated to 80.58 C. Is mercury (II) chloride an electrolyte in ethanol
A solution of 5.00g of an organic compound in 25.00g carbon tetrachloride boils at 84.8 c at 760torr. What is the molecular weight of the compound. (bpt ccl4 = 76.5 C, Kb = 5.03 C/m)
What would be the freezing point for a 0.35m solution of sodium bromide in water? (Hoff factor = 1.75)
A violin string of length 35 cm and mass 1.1 g has a frequency of 478 Hz when it is vibrating in its fundamental mode. What is the wavelength of the standing wave on the string
What mass of potassium chromate is needed to add to exactly 500g of water to produce a solution with vapor pressure of 21.50 torr at 24 C
The molar heat of fusion of naphthalene (C10H8) is 4610cal/mol. What is the heat of fusion in kJ/g
A person blows into a rubber tube connected to one arm of a manometer containing glycerin of relative density 1.260. what is the gauge pressure of the air in the person's lungs
A 23.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface, What is the force of friction acting on the block if T = 20.56 N
What is the heat of vaporization of a if 215mol of the liquid required 2040J of energy to vaporize at its boiling point
The warm source of a Carnot cycle consists of a blast furnace operating at a temperature of 150C, calculate the net heat absorbed from the warm source
From experimental data for rate of disappearance of CH3CHO, derive the rate law and the rate constant, k (with units).
Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1400kg/s with a speed of 7.1×104m/s
What is the equilibrium partial pressure of Cl2 at 250 oC? What is the value of Kc at the same temperature?
the colors of the solutions are red, yellow, green, and blue. Further experiments reveal that two of teh complex ions are paramagnetic with four unpaired electrons and teh other two are diamagnetic.
express the velocity of the electron in the Bohr model for fundamental constants, the nuclear charge Z, and the quantum number n. Evaluate the velocity of an electron in the ground states of He+ ion
Calculate the ratio of the drag force on a jet flying at 1132 km/h at an altitude of 10.0 km to the drag force on a prop-driven transport flying at 547 km/h
Why does K + N2 yield no reaction. could some one please explain what factors contribute to no reaction
A 10.4 m long steel beam is accidentally dropped by a construction crane from a height of 8.67 m. What is the induced EMF in the beam just before impact with the Earth
The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W=59600 N. What is the magnitude of the lift force
Calculate the rotational inertia of a meter stick, with mass 0.64 kg, about an axis perpendicular to the stick and located at the 18 cm mark
the energy carried away by one mole of potassium is 295KJmol^-1. What is the wavelength of a single photon? What is the color of this light emitted
Consider the motion of a muon as it moves through the Earth's atmosphere. After a time ? = 2.20 e-6 s, it decays into other particles. What is the speed of the muon
How can you calculate the quantitative precipitation of barium in a solid mixture of sodium chloride and barium chloride
Critically evaluate the procedure used in this experiment as a quantitative technique for the analysis of copper (II) ion. Suggest sources of errors and ways of minimizing the error