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1. A volume of saline solution has a mass of 25.6 g at 4 °C. An equal volume of water at the same temperature has a mass of 24.5 g.
2. What is the density of the saline solution? Children's Liquid Motrin contains 100. mg of the pain reliever ibuprofen per 5 mL. If the dose for a 45.0 lb child is 1.5 teaspoons, how many grams of ibuprofen would the child receive?
How many moles of carbon, C, were in the original sample?
Determine the Ka of a 0.1M solution of acetic acid in which the hydronium ion concentration is 1.35 x 10^-3 M
Question- The rate constant for this first order reaction is .830 s -1 at 400 C. How long in seconds would it take for the concentration of A to decrease from .690 M to .370M
What effect would placing a charged group in the interior of a protein have on its conformational stability
To what pH should a solution that is 0.075 M each in Ca2+ and Cd2+ ions be adjusted in order to best separate ions by precipitation of one of the hydroxides. What are the concentrations of the metal ions after the pH is adjusted to this value
1a. What is the chemical structure of caffeine? What structural features make it soluble in water, and in ethyl acetate? b. The solubility of caffeine is 2.2mg/ml at 250C, 180mg/ml at 80oC, and 670mg/ml at 100oC. Why does the solubility change with t..
A 0.01 M solution of hyperchlorous acid , which is a monoprotic acid, has a pH of 6.5 at 67 degrees C. Determine the Ka value of this acid.
A sample of gas in a balloon has an initial temperature of 3degrees celsius and a volume of 1740 L. If the temperature changes to 88 degrees celsius , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas
How much heat is absorbed or released in the reaction of 20.0 g of NH3 with sufficient oxygen to produce NO(g) and H2O(l)? 4 NH3(g) + 5 O2(g) g? 4 NO(g) + 6 H2O(l) ?H = -1168 kJ A
question a gas sample is heated from -20.0oc to 57.0oc and the volume increased from 2.00l to 4.50l. if the initial
The venom black widows has a rat LD50 of approximately 0.002 mg/kg. Assuming a density of 1g/ml, what volume of venom do black widows and rattlesnakes have to inject to have 50% chance of killing a human? What are the many assumptions that go into th..
Calculate what mass of solid potassium monohydrogen phosphate should be dissolved in this solution to yield the required buffer
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