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The activity R of a sample of an unknown radionuclide is measured at hourly intervals. The results, in MBq, are 80.5, 36.2, 16.3, 7.3, and 3.3. Find the half-life of the radionuclide
What is the hydronium-ion concentration of a 0.40 M solution of HCN (Ka= 4.9×10-10) at 25° C?
The gas-phase reaction C: RateH3NC = CH3CN has been studied in a closed vessel, and the rate equation was found to be: Rate = -delta [CH3NC]/delta t = k[CH3NC]. Which one of the folowing actions is least likely to cause a change in the rate of the..
How much energy would be absorbed or re- leased by the H2O in the process 30 grams H2O(g) at 100?C → 30 grams H2O(l) at 20?C.
How many moles of excess base are present? How many additional mL of 0.100 M HCl would be required to neutralize the solution?
identify the two important classes of catalysts. analyze the chemical reactions that take place when a biological
Calculate the amount of solute needed to prepare 50.0 mL of a solution of 0.15 M malonic acid (CH2(COOH)2) and 0.020 M MnSO4*H2O.
Devise a chemical method for distinguishing between maleic and malonic acid. I thought of bromination of maleic since it is an alkene. Would bromination also occure with malonic acid
Consider another expandable balloon is filled with nitrogen gas. The density of the gas is 1.24 g/L and the outside pressure is 1.05 atm. What is the temperature of the gas?
Yellowstone Lake has an area of 88,960 acres. How many liters of pure oleic acid (molecular mass = 282.5 and density = .895 g/ml) would be needed to cover this lake with a layer one molecule thick? Assume the oleic acid molecule occupies a cubic s..
A gas occupying a volume of 395 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
the vapor pressure of a liquid at 25c is 200 torr. what will happen when the barometric pressure pbar is lowered to 190
Problem- Draw the equation representing the condensation reaction in which alpha-D-lactose is formed.
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