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A typical deposit of cholesterol, C27H46O, in an artery has a mass of 3.90 mg. How many molecules of cholesterol are present in this deposit?
Which do you think would be larger and why? The first ionization energy, IE1, of Ne,The second ionization energy, IE2, of Na
calculate Delta S when the pressure of 1.0 mol of oxygen is doubled at a constant temperature T=298
The leaves of a Rhubarb contain high concentrations of diprotic oxalic acid (HOOCCOOH) and must be removed before the stems are used to make rhubarb pie. If pKa1=1.23 and pKa2=4.19, what is the pH of a .0282 M solution of oxalic acid
the structure of a protein by both NMR and X-ray crystallography and they differ in one region. Which is more likely to be the true structure of the protein when dissolved in solution? Why?
Given that the ionization energy of gaseous potassium is 419 kJ mol-1, calculate the lattice energy of potassium chloride.
Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.50 M B(aq) with 0.50 M HCl(aq)
what will the final mixture contain if 14.0 g of N2 and 35.5 g of Cl2 react to completion and the balanced equation is: N2+3Cl2--->2NCl3
Estimate the age of a bottled wine that has a tritium, 3^H, content 65.% that of freshly bottled wine. Tritium decays by beta decay and has a half life of 12.3 yr.
A 4.5 g nugget of gold absorbed 276 j of heat. What was the final temperature of the gold if the initial temperature was 25 OC ? The specific heat of gold is 0.129 j/g OC.
A compound contains atoms of three elements X, Y and Z.The oxidation numbers are X +2, Y +5 & Z -2.formula ? How can we formulate formula of a ternary compound using their valency?
What volumes of CO2 and NH3 at 201 atm and 450.°C are needed to produce 2.54 kg of urea, assuming the reaction goes to completion?
a light woman and a heavy man jump from an airplance at the same time and open their same-size parachutes at the same time. which person will get to a state of zero accerlation first?
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