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a. Suppose we want a soln containing 150 micrograms of the protein at a concentration of .5 mg/ml. To do this we will first evaporate the liquid from enough of the protein soln to get 150 micrograms. How much coln do we need to start with? How much H2O do we add to get the desired concentration?
b. If the protein has a MW of 15000, express its initial concentration in micromoles/ml and in micromoles/microliters. If we want 2 micromoles of the protein for a rxn, how much of the original soln do we need?
c. Suppose we want 1 ml of a 10 microgram/ml soln. How much H2O and protein stock must we add to get this?
d. Suppose we want 100 microliters of .1 micrograms/ml soln. How much H2O and protein stock must we add to get this?
In a gas mixture, the partial pressures are nitrogen 430 , oxygen 115 , and helium 235 . What is the total pressure ( ) exerted by the gas mixture?
A 0.456 gram sample of an unknown monoprotic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
What is the balanced molecular equation for the reaction between (Pb(NO3)2 and K2CrO4). Complete ionic and net ionic equations
The ph of 0.40 M HF(aq) is 1.93. Calculate the change in ph when 0.356 g of sodium fluoride is added to 50.0 ml of the solution .
required to reach the first equivalence point of a solution of citric acid (H3C6 H5O7), how many ml of NaOH are required to completely neutralize this solution
The air is cooled as the water evaporates. How much water must be evaporated to cool the air in a room of dimensions 4.0 m x 5.0 m x 3.0 m by 20. C? Assume that the enthalpy of vaporization of water is the same as it is at 25 c.
A certain substance, intially present at 0.500 M, decomposes by second-order kinetics with a rate constant of 4.00 x 10-1 L/mol min. Calculate the time (in minutes) required for the system to reach a concentration of 0.370 M.
Calculate the quantity of energy produced per gram of reactant for the fusion of two H - 2 (atomic mass = 2.014102 amu) atoms to form He-3 (atomic mass = 3.016029 amu) and one neutron.
A box contains a mixture of small copper spheres and small lead spheres. The total volume of both metals is measured by the displacement of water to be 427cm^3 and the total mass is 4.36 kg . What percentage of the spheres are copper?
Calculate the pressure in the flask in atmospheres and torr also If the sealed-tube manometer in had a height difference of 20.0 inches between the Hg levels?
What proportion of benzoic of benzoic should be used with an equimolar mixture of adipic acid and hexamethylene diamine to produce a polymer of 10,000 molecular weigh at 99.5% conversion?
Two molecules of 1,3-butadiene (C4H6) react to form 1,5-cyclooctadiene (C8H12). As the Reaction proceeds, the pressure in the container falls, because two gas molecules are consumed to produce one product molecule.
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