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A polyamide was prepared by bulk polymerization of hexamethylene diamine (9.22 g) with adipic acid (11.68 g) at 280 degrees C. Analysis of the whole reaction product showed that it contained 2.6 x 10-3 mol of carboxylic acid groups. Evaluate the number-average molar mass Mn of the polyamide, and also estimate its weight-average molar mass Mw by assuming that it has the most probable distribution of molar mass.
what is the molar mass of the unknown liquid in g/mole?
What will be the volume of the gas sample if the pressure increases to 780 mm and the temperature increases to 35°C
If a 1000 kilogram sample of rock is 0.021% gold by mass, how much zinc is needed to react with the gold extracted from the rock? Assume that the reaction is 100% efficient.
If 1.0 atm H2S (g) are added to a 1.0 L flask containing an excess of I2 (s), what will be the equilibrium pressure of HI?
Draw the structure (on a scratch sheet of paper) for the molecule that fits the following description and then name it according to IUPAC formalism:
A rigid tank contains 1.50 moles of an ideal gas. Determine the number of moles of gas that nust be withdrawn from the tank to lower the pressure of gas from 25atm to 35 atm.
Determine the mass of RbCN required to prepare a 500 mL solution which is .12 M RbCN (MW = 112 g/mol).
Predict the rate of change in the concentration of N2O over this time interval. In other words, what is dt [N2O]/ dt?
What is the mass in grams of 1.56 moles of menthol?
Calculate the concentrations of all species in a 1.73 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
Suppose it was found that in an equilibrium mixture of these gases the partial pressure of NH3(g) is 24.9 atm and the partial pressure of N2 is 6.68 atm. What is the partial pressure of H2(g)?
How much energy is required to vaporize 125g of butane at its boiling point? The heat of vaporization for butane is 23.1kJ/mol.
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