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Calculate the overall energy change in kilojoules per mole for the formation of CaCL(s) from the elements. The following data are needed: (a) Eea for CL(g) = -348.6kj/mol. (b) Ei1 for Ca(g) = +589.8kj/mol. (c) Ei2 for Ca(g) = +1145kj/mol. Heat of sublimation for Ca(s) = +178.2kj/mol. Bond dissociation energy for Cl2(g) = +243kj/mol. Lattice energy for CaCL2(s) = +2258kj/mol. Lattice energy for CaCL(s) = +717kj/mol (estimated)
10 mL of 0.1 M NaOH is added to 50 mL of 0.1 M of the hypothetical acid HA. write the chemical equation and calculate the molarity of NaA and HA in the final solution.
Describe two different ways by which electrons can move from the valence band to the conduction band.
the following factors controlling the synthesis of acetyl CoA in muscle and liver include all of the following EXCEPT: a. a high carbohydrate meal will influence the movement of fatty acids across the cell membrane by activating a cell membrane car..
In the purification process, the organic layer is washed sequentially with 2 M NaOH, water, and saturated aqueous sodium chloride. What is the purpose of each of these washes and why is cold 2 M NaOH recommended?
Z- is a weak base. An aqueous solution of NaZ is prepared by dissolving 0.350 mol of NaZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 8.93 at 25.0 °C
An experiment requires 43.0 of ethylene glycol, a liquid whose density is 1.114 . Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
exhales 30.0 times per minute, that the exhaled air is at a pressure of 1.00 atm, and that the air behaves as an ideal gas. Calculate the time in hours before a fire fighter using such an air tank runs out of air.
Using the intermolecular bonding between H2O molecules (bonding that exists in solid ice versus liquid water), explain why: 1) ice floats 2) ice formed in the crevices of a road or the granite face of a mountain is able to crack the road or cause ..
a natural hormone of moths has a molecular formula of C21H40(its a zero not an o) and yields the following three compounds on ozonolysis; (1) dodecanol
A buffer is made using 45.0 mL of 0.750 M HC3H5O2 and 55.0 mL of 0.700 M NaC3H5O2.What volume of 0.10 M NaOH must be added to change the pH of the original buffer solution by 2.5%? Ka for this acid is 1.3 x 10
Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 25.8 oC ) by the evolution of hydrogen in the subsequent reaction
How many milliliters of ammonium sulfate solution having a concentration of 0.411 M are needed to react completely with 61.4 mL of 1.24 M sodium hydroxide solution. The net ionic equation for the reaction is
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