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A 32.90-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.00 mL. The solid and toluene together weigh 58.34 g. The density of toluene at the temperature of the experiment is 0.864 g/mL.
What is the density of the solid?
find the ph of the solution at the following points in the titration: a) before any base is added b) when half the acetic acid has been neutralized c) at the equivalence pt.
Describe an electrochemical cell tthat would have the following net equation, by answering the following questions.
Draw the following peptides, AND indicating the amide bonds that are formed through the side chains. What are the pKa values of the various groups on the peptide?
A 70kg skier is going down a hill that is inclined at a 12 degree angle to the horizontal. the coefficient of kinetic friction between waxed skies and snow is .05. The force of the air resistance on the skier is 15.6N. find the skiers acceleration..
One a cold day a person takes a breath of 450 ml of air at a pressure of 745 mm Hg and room temperature of 21oC. What is the volume of this air in the lungs at 37oC and 758 mm Hg?
Calculate the mixing ratio (ppbv) of NO2. Assume T=20 degrees Celsius = 293 K; P = Atmospheric pressure. MW of NO2 = 44g/mol
Based on the Hume-Rothery Rules, speculate on the possible driving forces behind the tendency for ordering in this system.
It required 22.7mL of HCl to reach the orange-red end point. Calculate the molar solubility and Ksp of calcium hydroxide.
What is the pH when enough 0.100 base is added to neutralize 8.00 mL of 0.100 M acid? Note: Make simplifying assumptions
Dissolving 3g of an impure sample of CaCO3 in HCl produces .656 L of CO2, measured at 293 K and 1.04 atm. What is the percent by mass of the CaCO3 in the sample?
Calculate the 1) mls of 15M Acetic acid 2) the grams of sodium acetate 3) and the mls of water required to make a 500mM acetate buffer at pH 4.85
Find the ?H for the reaction below, given the following reactions and subsequent ?H values: PCl5(g) ? PCl3(g) + Cl2(g)
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