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A sample of a radioactive substance used in detecting skin cancer produced 592 counts in one minute at the beginning of a test and a count of 451 counts in one minute after one day. If the background counts-per-minute was 48, what is the half-life of this radioactive substance?
Calculate the pH of each of the following solutions containing two solutes in the concentrations indicated. (a) 0.50 M HOAc (acetic acid), 0.5 M NaOAc (sodium acetate); Ka = 1.8 x 10-5
a 10 ml sample of a solution of pbclo32 was diluted with water to 170 ml. a 100 ml sample of the dilute solution was
Calculate the pH of 1.00 L of a buffer that is 0.140 M HNO2 and 0.180 M NaNO2. What is the pH of the same buffer after the addition of 1.00 mL of 12.0 M. HCl. (pKa of HNO2 = 3.40). What is the pH of the Original buffer and after HCl is added?
suppose you wanted to dissolve 106 g of Na2CO3 in enough H2O to make 6.00L of solution what is the molar mass of Na2CO3.
a skyscraper in pittsburgh built in the early 1970s is supported by water filled columns. potassium carbonate was added
A 0.75 L bottle is cleaned, dried, and closed in a room where the air is 22 degree Celsius and 44% relative humidity (that is, the water vapor in the air is 0.44 of the equilibrium vapor pressure at 22 degree Celsius). The bottle is brought outsid..
If a fresh golden delicious apple weighing 4.30 (120 ) contains 17.0 of fructose, what caloric content does the fructose contribute to the apple?
A titration is performed on 1.3245g of a sample of a diprotic acid that is dissolved in 50 ml of water. if 44.10 ml of .6124 M NaOH is required to reach the end-point, what is the molecular weight of the diprotic acid
Determine the following characteristics of the titration curve for 25.0 mL of 0.400 M NH3(aq) titrated with 0.335 M HI(aq). (For NH3, Kb = 1.8x10-5.) Enter scientific notation as 1.23E4
The addition of solid NaSO4 to an aqueous solution in equilibrium with solid BaSO4 will cause what? Ksp at 20 degrees C of BaSO4(s) = 1.5 x10^-9
Draw a flow chart showing the procedure and the observations to be expected at each step with each of the possible cations.
the gaseous product of a reaction is collected in a 25.0 l contained at 27 degrees celsius. the pressure in the
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