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A .6004-g sample of Ni/Cu condenser tubing was dissolved in acidand diluted to 100.0 mL in a volumetric flask. Titration of bothcations in a 25.00 mL aliquot of this solution required 45.81 of.05285
A sample of an ethanol-water solution has a volume of 53.7 cm3 and a mass of 50.5 g. What is the percentage of ethanol (by mass) inthe solution? (Assume that there is no change in volume when the pu
The amino acids His 31 and Asp 70 are separated by ~0.35 nm in T4lysozyme. Calculate the Coloumbic potential between the two chargedside chains (make the assumption that these are point charges in
A certain gas expands in volume from 1.75 to 8.32L ataconstant temperature. Calculate the work dine in Joules by the gas if it expands against a constant pressureof 3.8 atm.
A 249-gram sample of water is heated from 2 degrees C to 85degrees C. Calculate the amount of heat absorbed (in kJ) by the water.
Magnesium oxide decomposes into magnesium and oxygen. If12.09 g of magnesium oxide decomposes to form7.29 g of magnesium, what mass of oxygen gas is also released in the reaction?
Calculate the concentration of nonelectrolyte solute particlesin human blood if the osmotic pressure is 7.53 atm at37oC, the temperature of the body.
A 227 mL benzene solution containing2.53 g of an organic polymer has anosmotic pressure of 8.63 mmHg at 21°C. Calculate the molar mass of the polymer. (g/mol)
Calculate the mass in grams of area that must be added to150.g water to give a solution whose vapor pressure is 2.5 mm Hgless than that of pure water at 40 oC (vp H2Oat 40 oC =55.34 mm Hg).
Suppose 0.2506g of Na2C2O4 isdissolved in 250mL of 1M H2SO4. This solution requires 34.7mL of KMnO4 solution for titration, what is the molarity of the permanganate solution?
A solution containing ethylene glycol and water has a vapor pressure of 7.88 torr at 10C. Pure water has a vapor presssure of 9.21 torr at 10C. What is the mole fraction of ethylene glycol in the so
Assume that amolecule can adopt 10,000 distinct conformations. The energy of the ground state conformationis -4.0 kcal/mol, whereas the energies of the other 9,999conform ations are degenerate (each
Why conceptually, does the ground state for the particle in the boxmodel correspond to n=1 while for the harmonic oscillator and the particle on a ring model it is n=0? For all three models, why do
Will the equilibrium constant,Kp, for this Sysatem be large or small at temperature greater than298ok? Explain your justification.
An infant ibuprofen suspension contains 100 mg/5.0 mL suspension. The recommended dose is 10 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 20lb?
Why are aqueous solutions of ammonia sometimes called ammonium hydfroxide? Write the appropriate chemical equation for the equilibrium which applies.
Liquid helium at 4.2 K has a density of 0.147 g/mL. Suppose that a 1.00-L metal bottle that contains air at 105K and 3.0 atm pressure is sealed off.
Gypsum is hydrated calcium sulfate. a 4.89 g sample of this hydrate was heated, and after the water was driven off, 3.87g anhydrous calcium sulfate remained. Determine the formula of this hydrate a
How many hydrogen bonds can each water molecule participate in?Illustrate your answer by drawing as many water molecules as isnescessary to support your answer and use dashed lines (----) toindicat
A gas at 350K and 12 atm has a molar volume 12% larger than that calculated from the perfect gas law. Calculate (a) the compression factor under these conditions and (b) the molar volume of the gas.
How do you use formula 4-2 d=C/n(L)M where C is a constant that experimentally has a value of 1.5, M is the correction for magnification, and n(L) is the number of grain boundaries crossed to estim
In the laboratory a student named Georgia weighed 4.75 g ofan unknown solid mixture containing benzoic acid, copper (II)sulfate, and sand. She added 15 mL of acetone to her sample and dissolved one
Hexane has a normal boiling point of 68.7 C. What is the mole fraction of a nonvolatile solute in a hexane solution which has avapor pressure of 600 torr at 68.7C?
A fixed amount of gas at 20 degrees Celsius occupies a volume of12.0L under pressure of 650 torr. Calculate its volume at the same pressure when the temperature is increased to 280 degrees Celsius.
An unseeded BOD test is conducted on a polluted surface water sample by adding 100 mL of the sample to a 300-mL BOD bottle and filling with dilution water.