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The crystal lattice energy of an ionic solid, XY, -1,331.0 kJ/mol. The total hydration energy for both X+ and Y- ions is -954.5 kJ. Determine the Enthalpy of solution of the solid.
Another solution of the same chemical is measured under the same conditions and has an absorbance of 0.81. What is its concentration?
Compute the value of ΔH ° if the combustion products are CO2 (g) and H2O (g). it isgiven that: CO 2 (g) = ΔHf ° - 393.5 kJmol-1; H 2 O (l) = ΔHf ° -285.8 kJmol-1; H 2 O (g) = ΔHf ° -241.8 kJmol -1.
How many mls of the KH2PO4 stock solution will you use. The pKa values for phosphate are 2.12, 7.21, and 12.3. Thank you for your assistance.
Calculate the pH for an aqueous solution of acetic acid that contains 2.15x10^-3M hydronium ion.
The system CO2(g) + H2(g) *) H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO.
An experiment shows that a 250mL gas sample has a mass of 0.434g at a pressure of 744mm Hg and a temperature of 27C. What is the molar mass of the gas?
A 5 cm thick beef steak is being frozen in a -30 C room. The product has 73% moisture content, density of 970 kg/m^3, and a thermal conductivity (frozen) of 1.1 W/ (m K). Estimate the freezing time using Plank's equation
A stock solution is prepared by adding 21 mL of 1 M AlCl3 to enough water to make 76 mL. What is the Cl- concentration of 40 mL of the stock solution?
Explain the general physics of chromatography. Illustrate these general principles with regard to paper, thin layer, gas, liquid, and super-critical fluid column and open tube chromatography.
You are in a mountain range with atmospheric air pressure of 520 , and you wish to boil some eggs. What is the approximate boiling point of the water at this air pressure
calculate the expected degree of polymerizationand the molecular weight of the polymer if a) all the termination reaction occurs by combination and b) all the termination occurs by disproportionation.
Write one overall equation, using an alkali metal ion and a nitrate ion as spectator ions if needed, for the following net ionic equation: H+(aq) + OH-(aq) ? H2O(l)
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