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How many grams of urea (NH2CONH2) must be added to 450 g of water to give a solution with a vapor pressure 2.50 mmHg less than that of pure water at 30C? The vapor pressure of pure water at 30C is 31.8 mmHg. Assume urea is nonvolatile.
Consider the following reduction potentials: Cu2+ + 2e- -> Cu E° = +0.34 V Pb2+ + 2e- -> Pb E° = -0.13 V For a galvanic cell employing the Cu, Cu2+ and Pb, Pb2+ couples, calculate the maximum amount of work that would accompany the reaction of one..
the mass natural abundance of the isotopes h and d are 99.985 and 0.015 respectively. the mass natural abundance of
What is the total mass of water raised 68.7 m during this 206.0 minute period? (in kg) How long can the turbines produce 335.0 MW of power from the release of the mass of stored water calculated above? Assume the water sustains a friction loss of ..
The osmotic pressure of a aqueous solution of a given polymer with mass concentration 0.300 g/mL is 10.0 torr at 298 K. Estimate the molar mass of the polymer.
Write electron configurations for the following ions, and determine which have noble-gas configurations. Explain your answer. (a) Cr^3+ (b) N ^3- (c) Sc^3+ (d)Cu^2+ (e)TI^+ (f)Au^+
What is the oxidation number of Mn before and after the reaction- 5H2AsO3 + 2MnO4- + 6H+ + 2Mn2+ + 5H3AsO4 + 3H2O
How do the values of delta G compare to those calculated from delta H and delta S? which of these two methods could be used to determine how delta G changes with temp?
A hydrogen atom with an electron in its ground state interacts with a photon of light with a wavelength of 1.22 × 10^?6m. Could the electron make a transition from the ground state to a higher energy level? If it does make a transition,
mos2s 72 o2g moo3s 2 so2g moo3s 3 h2g mos 3 h2os calculate the volumes of air and hydrogen gas at 23degc and 1.00
The enthalpy change when 1 mol methane (CH4) is burned is -890 kJ. It takes 44.0 kJ to vaporize 1 mol water. What mass of methane must be burned to provide the heat needed to vaporize 1.00 g of water
Amstop Company issues $20,000,000 of 10-year, 9% bonds on March 1, 2007 at 97 plus accrued interest. The bonds are dated January 1, 2007, and pay interest on June 30 and December 31. What is the total cash received on the issue date?
You are given a stock concentration of alcohol dehydrogenase (ADH). The molecular weight of ADH is 35,000 g/mol. What is the molarity of a 35 mg/mL stock solution of ADH
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