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The first order decay of a radionuclide was observed. The initial activity was 0.00658 disintegrations per second per gram and after 317 seconds, the activity was 0.00213 disintegrations per second per gram. What is the half-life, in seconds, of the radionuclide?
A 47.5 g sample of metal was heated to 100 degrees C and then poured into 100 g of water at 24.0 degrees C. The temperature of the resulting mixture was 28.0 degrees C.
A 70.6 L constant-volume cylinder containing 7.44 g Hg is heated until the pressure reaches 3.80 atm. What is the final temperature in degrees Celsius?
The Ka value for acetic acid, CH3COOH (aq) is 1.8x10^-5 M. Calculate the pH OF 3.00 M acetic acid solution. Next, calculate the pH of the resulting solution when 2.501 mL of the 3.00 M acetic acid is diluted to make
The reaction is: 2Al + Fe(III)2 O3 = 2Fe + Al2O3 If 1 kilogram of iron (III) oxide is used, what is the minimum amount of aluminum power to use to insure that all metallic iron that can be made is made
How many grams of magnesium hydroxide are present in 1.0 L of a saturated solution at room temperature
As the protons are transported into the cell, ATP synthesis can be coupled to this process by the enzyme ATP synthase. At 100% efficiency, under the conditions listed above, how many protons must be transported to synthesize one molecule of ATP
the radiation level was determined to be .00935 microCi/mL. If 51Cr has t1/2=27.7 days, what is the volume of blood in the patient?
the concentration of a sodium hydroxide solution is determined by titrating it against a sample of potassium hydrogen
Consider the same dilution above for an SN1 reaction. Would the time required for 95% for the starting material to react change as a result of this dilution?
the acid-dissociation constants of phosphoric acid h3po4 are ka1 7.5 times 10-3 ka2 6.2 times 10-8 and ka3 4.2 times
A certain volume of a 0.90 M solution contains 4.1 g of a salt. What mass of the salt is present in the same volume of a 2.8 M solution
What are the normal boiling points of cyclohexane and toluene. Without looking up the actual value, which has a higher vapor pressure
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