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Calculate the lattice energy of NaCl. Heat of sublimation is 108kj/mol and Heat of NaCl is -411kj/mol. Energy to dissociate .5 mole of Cl2to an atom of Cl is121.4 kj/mol.
a photon has a wavelength of 741nm calculate the energy of the photon in joules
A 0.150- M solution of chloroacetic acid (HC2H2ClO2) has a pH of 1.86. What is the value of Ka for this acid and the percent ionization?
adding the two portions of water into your calorimeter the temperature of the mixed portions of water to be 45 oC. determine the heat capacity of the calorimeter?
How much heat is required to convert 25.0g ethanol at 25C to the vapor phase at 78C? How much to convert 5.00 L?
An aqueous solution containing 34.1 g of an unknown molecular (nonelectrolyte) compound in 141.3 g of water was found to have a freezing point of -1.5 degrees C. Calculate the molar mass of the unknown compound.
a mixture of 0.47 mole of H2 and 3.59 moles of HCl is heatedto 2800 degrees C. Calculate the equilibrium partial pressures of H2, Cl2,and HCl if the total pressure is 2.00 atm. For the reaction:
Calculate the final Celsius temperature of hydrogen chloride gas if 0.500 L at 35°C and 0.950 atm is heated
For a solution containing 0.0060 M calcium nitrate and 0.057 M nitric acid, calculate the activity of the calcium ion.
The equilibrium constant for the interconversion of PCl5 and PCl3 is 0.0121: PCl5 = PCl3+Cl2. A vessel is charged with 0.123 mol PCl5. At equilibrium what is the concentration of PCl3
The pressure and colume are simultaneously increased so that at every instant P and v are related by the equation, P = Av, where A is a constant.
The pH of an aqueous solution containing only a monoprotic weak acid has a pH of 4.1. What is the concentration of hydronium ion, H3O+, in the solution? (a)2 x 10?3 M (b)2 x 10?4 M (c)8 x 10?4 M (d)8 x 10?5 M (e)0.61 M
Describe two different ways by which electrons can move from the valence band to the conduction band.
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