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If 105 of fluorine-18 is shipped at 8:00 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 P.M. ?
A 2.9 m solution of methanol (CH3OH) in water has a density of 0.984 g/ml. What are the a) mass percent, b) molarity, and c) mole fraction of methanol in this solution?
Then 2.00 mL of solution containing 0.0156 M dopamine was mixed with 90.0 mL of unknown, and the mixture was diluted to 100.0 mL in volumetric flask. The signal from the new solution was 58.4 nA. What is the dopamine concentration in the unknown s..
The vapor pressure of pure propyl chloride is 347 torr at 25°C and that of pure propyl bromide is 133 torr at 25°C. Assume that the solution is an ideal solution.
What is the concentration of iron(III) ion in a solution made by taking 10.00 mL of a 0.300 M Fe3+ solution and diluting it to the mark in a 100.0 mL volumetric flask?
For the following pairs of orbitals, indicate which orbital is lower in energy, and give a brief explanation why. a) sulfur 3p vs. sulfur 3d
A solution of iodine was standardized with ascorbic acid. A 0.1150 g sample of ascorbic acid required 28.37 mL of I2 to reach a starch end point. Calculate the molarity of the iodine solution.
Since phosphate ionization of 2.14, 6.86 and 12.4. you make stock buffer 500mM in 1L. You decide to make one stock pH 6.5 and the other ph 7.2 How many mmols of what type of phosphate componet do you add to each of these buffers?
You have a sample of a white crystalline substance from your kitchen. You know that it is either salt or sugar. Although you could decide by taste, suggest another property that you could use to decide.
Which satisfy the octet rule and which do not? PS3, SO2, SO3, NO3-1, CO3-2, PCl5
make a reversible isobaric expansion to state B: (V=44.8L). make a reversible isochoric expansion to C: (p=0.5atm), and finally makes a reversible isothermal compression back to A.
What would affect the chemical shift of the sp3 hybridized carbon atom that would cause its peak to appear at ~ 64 ppm
Give the conjugate acid of the following Bronsted-Lowry bases. (Type your answer using the format [OH]- for OH -.) (a) HAsO42- (b) F - (c) S2- (d) OH-
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