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A radioactive element has a half-life of 2.2 hours. How many hours will it take for the number of atoms present to decay to one-sixteenth of the initial value? Show your calculations please.
Which is the limiting reagent in the reaction between Copper sulfate pentahydrate and ammonia?
Hydroxyl radical (OH) is produced from the photolysis of H2O or through reaction with excited oxygen, H2O + hν --> H + OH or O* + H2O---> 2OH
A solution is prepared by condensing 5.01L of a gas, measured at 27.0 degrees celcius and 769 mmHg pressure, into 72.1g of benzene. Calculate the freezing point of this solution.
A 20.0-mL sample of 0.25 M HNO3 is titrated with 0.15 M Na OH. What is the pH of the solution after 30.0 mL of NaOH have been added to the acid?
Constant-boiling HCl can be used as a primary standard for acid-base titrations. A 50.00 mL sample of constant-boiling HCl with a concentration of 0.1193 M was collected and titrated to an end point with 34.89 mL of Ba(OH)2 solution. What is the m..
Find the number of automobiles whose total mass is the same as 1.0 mol blueberries if The mass of an average blueberry is 0.77g and the mass of an automobile is 2000 kg ?
Show the mutarotation of beta-D-glucopyranose to the alpha-D-glucopyranose. Show the open chain intermediate.
Guesstimate the extent of the dipole moment of H 2 O in Debye units, treating H 2 O as three point charges. suppose the O-H distance = 1.00 A, angle H-O-H =104°. The
All of the potassium reacted to produce bubbles of hydrogen gas, which, because of the extraordinary care that was taken, did not ignite. How much hydrogen gas was produced, in units of moles?
How many mL of a 0.8 M NaOH(aq) solution are required to make 500 mL of a solution with pH=12.50?
What is the percent yield of a reaction in which 41.5 g tungsten (VI) oxide is combined with excess hydrogen gas to produce metallic tungsten
a sample of SO2 gas which weighs 0.81 grams has a volume of 1.20 liters when collected at 25 degrees celcius, what would be the pressure of the gas sample?
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