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A 50.0mL volume of 0.15M HBr is titrated with 0.25M KOH. Calculate the pH after the addition of 19.0 mL of KOH.
Calculate how long will it take for a sample of radionuclide with a half-life of 27.1 days decay to 1.0% of its original value.
what is the reaction mechanism for the formation of isoamyl acetate from the esterification reaction of isoamyl alcohol and ethyl acetate with a sulfuric acid catalyst?
When the band relaxes, the chains return to a tangled state. what happens to the entropy of the band when a stretched band relaxes
You want to prepare a pH=4.50 buffer using sodium acetate and glacial acetic acid. You have on hand 300 mL of 0.100 M sodium acetate. How many grams of glacial (water free) acetic acid should you add to prepare the buffer
How many atoms of 90Sr are in a 220.0 mL glass of milk with 1.25 Bq/L of 90Sr radioactivity? (The half life for the beta decay of strontium
Find the mass of sodium required to produce 5.68 L of hydrogen gas at STP from the reaction described by the following equation: 2 Na + 2 H2O ® 2 NaOH + H2
The half-life of Plutonium-239 is 24,000 years. If 10 gms are present now, how long will it take until only 10% of the original sample remains? Round your answer to the nearest 10,000th.
determine how many grams of oxygeno2 would be used when 10.82 litres nitric oxide nog is formed at the temperature of
An aqueous solution has a vapor pressure of 80.8mmHg at 50 degrees Celsius . The vapor pressure of pure water at this temperature is 92.6mmHg. What is the concentration of CaCl2 in mass percent
in a reaction where pbcl2 precipitate was formed using pbno33 and hcl explain why the pbcl2 precipitate dissolved when
Using standard enthalpies of formation, calculate the change in enthalpy for the following reaction: 2C6H6 + 15O2 = 12CO2 + 6H2O. How many grams of C6H6 must be combusted in the above reaction to produce 2570 kJ of heat energy
A 35.2ml, 1.66M KMnO4 solution is mixed with 16.7ml of .892M KMnO4 solution. Calculate the concentration of the final solution
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