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A certain element has three isotopes. The isotopes masses (amu) and abundances are 159.37( 30.60%), 162.79 (15.79%) , and 163.92(53.61%). Explain what is the average atomic weight (amu) of the element?
A container is filled with C2H6O until its concentration reaches 1.375 mol. How many minutes will it take for 71.5 percent of the C2H6O break down?
What is the pH of the solution when 35.00 ml of sodium hydroxide has been added
Consider a steel containing 0.6% carbon and 10% chromium. Estimate the eutectoid temperature and concentration. What is the proeutectoid phase
What mass of sucrose, in grams should be combined with 531g of water to make a solution with an osmotic pressure of 8.95atm at 315K
Describe the process that will result in the greatest amount of work done by the system with a constant external pressure and calculate w. What is the least amount of work done with no restrictions on the external pressure
When an ionic solid dissolves in water, water molecules attract the ions causing them to dissociate of come apart. The resulting dissolved ions are electrically charged particles that allow the solution to conduct electricity. The following chemic..
Explain what is the balanced overall net-ionic equation for the reaction between oxalic acid and the permanganate ion, MnO4-
How many kJ of heat are needed to completely melt 1.30 moles of , given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.
How many grams of formic acid, HCOOH, must be added to 0.240 L of 0.110 M sodium formate, HCOONa, to yield a buffer solution with a pH of 3.50. Assume no volume change. Ka of HCOOH = 5.0 10-4
A sample of an unknowk gas effuses in 11.6 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. what is the molar mass of the unkown gas
determine the volume of a cube 10,62 cm, give an example of four sets of measurements that illustrate an imprecise and inaccurate data
A sample of cerium-141 for a diagnostic test was dissolved in saline solution to an activity of 4.5 millicuries/mL. If the patient undergoing the test needs a dose of 10 millicuries
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