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The beta decay of cesium-137 has a half-life of 30 years. How many years must pass to reduce a 25 mg sample of cesium 137 to 8.7 mg?
The atmospheric pressure in La Grande (683 atmospheric pressure) is significantly lower than that of Portland
Equal masses of water and ethylene glycol are mixed. What is the concentration of ethylene glycol in units of molality? The molar mass of water and ethylene glycol are 18.02 g/mol and 62.07 g/mol, respectively.
How many grams of NH4Cl must be added to 0.490 L of 1.00 M NH3 solution to yield a buffer solution with a pH of 8.90?
Qualitatively, describe how an acid-base indicator works. Why do we want to use a minimum amount of indicator in a titration? Select all that apply.
Write an equation for the formation of the salt that could be formed by reaction of one molecule of adipic acid with two molecules of ethylamine
you add 7.3 iron to 25.10 of water and observe that the volume of iron and water together is 26.03. calculate the
Sulfuric acid is a strong monoprotic acid. The bisulfate anion is a weak acid with a pKa of 1.92. Calculate the pH of a 0.1000 M solution of sulfuric acid.
The equilibrium constant of a reaction is found to fit the expression ln K = A + B/T + C/T^3 between 400 K and 500 K with A = -2.04, B = -1176 K, and C = 2.1 x 10^7 K^3. Calculate the standard reaction enthalpy and standard reaction entropy at 450..
An aqueous antifreeze solution is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol.
A subsequent titration revealed that the concentration of the unknown acid was 0.868 M. What was the concentration of the diluted acid om the Erlenmeyer flask?
Different manufacturers claim to have the best antacid. Which of the following tablets would neutralize the most acid for the money
the temperature of a sample of helium at 85 kpa is 37 degrees celsius. if the volume of the gas remains constant at
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