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a) One mole of ice is warmed from 220 K to 300 K at constant pressure of 1 bar. Find the enthalpy change (delta H) for this process. b) If we assume that the volume of the ice/water does not change significantly during the process in part a, what is the energy change (delta U)? c) In fact, when the ice melts the density changes from 0.9167 g/cm^3 to 1.000 g/cm^3. If we assume that the volume change is due entirely to the density change (that is, neglect thermal expansion of the ice/water), what is the difference between the enthalpy change and the energy change during the process? Is this a significant difference, compared to the total energy change?
A 3.5 L container is filled with gas at 1.00 atm. A piston then compresses the gas to 0.250 L. What is the new pressure?
Calculate the pH of the solution at the half equivalence point. Explain how the pH at the half equivalence point is related to Ka for the weak acid.
How many grams of (NH4)2SO4 should be present to prevent precipitation of Mg(OH)2 (s). The Ksp of Mg(OH)2 is 1.8x10^-11.
If the concentration of bromide ion in a saturated solution in equlibrium with PbBr2 solid is determined to be .0125M what is the solubility of PbBr2
A gas sample containing 1.35 mol at 25°C exerts a pressure of 405 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800. torr, how many moles of gas were added to the container?
Its normal boiling point is 111.0oC and its molar heat of vaporization is 35.9 kJ/mol. What would be the vapor pressure (in torr) of toluene at 75.00oC?
Assume also that on a yearly basis the lake is completely mixed, and that the small river flowing into and out of the lake can be neglected as far as acidification is concerned. How many years will it be before the lake will reach a pH of 5.0?
A 128.2mL sample of 0.15M solution of H3PO4 is titrated with 0.18M NaOH. What volume of base must be added to reach the third equivalence point
Using given data, calculate the change in Gibbs free energy for each of the following reactions. In each case indicate whether the reaction is spontaneous at 298 K
determine How many grams of AlCl 3 are formed if 30.0 grams of Hydrogen are produced? It is given that the molar mass of AlCl 3 =133.33 g/mol.
a .350 g sample of a biomolecule was dissolved in 15.0 g of chloroform, and the freezing point depression was determined to be .240 degree celcius. Calculate the molar mass of the biomolecule.
Calculate the concentration of chloride ions in a saturated lead(II) chloride (Ksp = 2.4 ? 10-4) solution.
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