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26. How does one determine the pressure-volume work done on or by a gaseous system? 28. How does one determine the internal energy of a reaction carried out under constant volume like bomb calorimetry? 30. How is the enthalpy of a system determined from the internal energy and the work done?
Pyridine(C5H5N) is a weaker base in H2O than 2,6 lutidine (dimethylpyridine), but we observe that the pyridine-BF3 complex is more stable than the comparable lutidine-BF3. Explain the reason for this inversion in stabilities.
A solution of .637g of the solid in 24.1g of the solvent diphenyl gave a freezing point depression of 1.76 degree celsius. Calculate the molar mass and molecular formula of the solid(k1 for diphenyl is 8.00 degree celsius/m)
The Group 5A elements can form molecules or ions with three, five or six covalent bonds. Predict the molecular structure and hybridization of the following substances: NH3, AsCl5 and PF6-. Why doesn't NF5 or NCl6- form
Calculate the vapor pressure lowering of a solution of 2.40 g of aspirin (molecular weight = 180.15 g/mol) in 55.0 g of methanol (CH3OH) at 21.2°C
A portable electric water heater transfers 255 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in minutes) will it take to heat the 5.5 L of water from 24 degrees C to 41 degress C? (Assume that the water has a density of 1..
HCN is a weak acid dissolved in water. (Ka=6.2x10^-10). If a 50.0mL sample of 0.100 M HCL is titrated with 0.100 M NaOH 1) what is the pH at the equivalence point
a student is examining a bacterium under the microscope. the e. coli bacterial cell has a mass of 1.00 where a
what is the ksp value of potassium hydrogen tartrate at 10 degree celsius oc 22oc 35oc and 50oc? what is the enthalpy
At room temperature benzoic acid dissolves in the less polar solvent, ether, but not very much in the more polar solvent, water. However, the deprotonated species, the benzoate ion, dissolves in water but not ether
Identify the major attractive force between each of the following atoms or molecules: a) He; b) HBr; c) SnH4; d) CH3-CH2-CH2-OH.
Problem- For each of the following gas-phase reactions, write the rate expression in terms of the appearance of each product or disappearance of each reactant. N2(g)+2H2(g)N2H4(g)
Calculate the volume of 0.188 M HNO3 required to neutralize 25.0 mL of 0.250 M Ba(OH)2 solution
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