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The standard entropy of pb(s) at 298.15K is 64.80JKmol. The normal melting point of lead is 327.4 degree and the enthalpy of fusion under these conditions is 4.770 klmol. The heat capacities for lead in KJmol are
Cp(s)= 22.13 + 0.01172T+9.6x10^4 T^-2Cp(l) = 32.51 + 0.00301 T
Calculate deltaH and deltaS for the transformation pb (s,25 degrees) (arrow) pb(l,400 degrees). What is the standard entropy of pb(l) at 400 degrees?
If an aqueous solution has a hydronium ion concentration ([H3O+]) of 5.10 x 10-9 mol/L, what is the hydroxide ion concentration ([OH-]) in the solution
A flask contains 0.180 of liquid bromine,. Determine the number of bromine molecules present in the flask.
Calculate the molarity of Ag in a solution resulting from the mixing of 30 mL of a 0.0250 M AgNO3 solution and 11.51 mL of K2CrO4
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what is the molecular formula of a compound that contains 28.2% of potassium ,25.6% of chlorine and 46.2% of oxygen ? the molar mass is 138.5u.
What atomic or hybrid orbitals make up the sigma bond between Br and Cl in bromine trichloride, BrCl3 ?
An unknown compound with a molecular formula of C8H18 reacts with chlorine in the presence of light and heat
In organic synthesis, we are often using drying agents such as sodium sulfate, magnesium sulfate, etc. to dry our solutions. Which of the following is true? (There are more than one correct answers)
How to calculate the volume of 1.5M aqueous pottasium hydroxide require to react completly with 2g of benzoic acid and extract the solution twice using the volume calculated?
What is the dissociation constant, Kd, of a ligand with a percent occupancy (or fractional saturation) of 20% when [ligand]
While Xeloda works well, it is effective for colorectal tumors and liver cancer. What are the drawbacks for extending this therapy to other types of cancer?
An aqueous solution contains 12.7% NaCl by mass. What mass of water (in grams)is contained in 2.5L of the vapor above this solution at 55 celcius? the vaor pressure of pure water at 55 celcius is 118 torr.
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