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A sample of the Dead Sea Scrolls gives a ^14C decay rate of 731 disintergrations/h. A modern sample gives 920 disintergrations/h. Estimate the age of the Scrolls from these data
Calculate the entropy change. What would be the value of S if the heating were carried out irreversibly?
1.464 g of an unknown hydrocarbon (112.6 g/mol) burns in bomb calorimeter in excess oxygen. The heat capacity of the calorimeter,Cv, = 5.234 kJ/ºC and ?T =5.744 ºC. Find ?E for this hydrocarbon in kJ/mol.
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8)
Calculate the root mean square speed of (a) Xe atoms and (b) He atoms at 298K. What si the root mean square of each of these at 500K?
What is the pressure (in atmospheres) of a sample of gas trapped in the closed-tube mercury manometer
50.0 mL of 2.00 M H2SO4 react with 75.0 mL of 2.00M NaOH. Identify the limiting and excess reactants. How many grams of Na2SO4 will be formed.
A sample of pure NO2 is heated to 388C at which temperature it partially dissociates according to the equation.
A student placed 20.0 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached.
what is a disccussion part for determination of the molar volume of a gas and atomic weight of a metal?
What is the molarity of a solution made by mixing 213.6 ml of 1.5 M NaCl with 328 ml of 4.3 M NaCl.
Why is a mixture of alcohol and water used, rather than simply water itself, to saponify the fat or oil
A 0.100 M solution of a weak acid, HX, has a pH of 2.110. What is the value of Ka for HX?
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