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If 115 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. ?
What is the change in enthalpy when 18.4 g of steam at 100?C is converted to liquid water at the same temperature and pressure? The heat of vaporization of water is 40.7 kJ/mole. Answer in units of kJ.
An aqueous vinegar sample contains 5.4% acetic acid by mass and has a density of 1.006 g/mL. Calculate the amount of acetic acid in grams in 2.00 L of this vinegar. Report your answer using the correct number of signi?cant ?gures.
What is the pH of a phosphate buffer when [H2PO4-] = 40 mM and [HPO42-] = 30 mM?
The nitration of toluene gives o- and p-nitrotoluene as the major products
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8)
If 30.0mL of .150M calcium chloride is added to 15.0 mL of .100 M silver nitrate what will be the final concentration of all ions the remain in the solution?
If 18.08 grams of ammonia (NH3) react, how many grams of water should theoretically be produced?
Determine how many grams of copper sulphate are there in 219 grams of an aqeous solution that is 20.2% by weight of copper sulphate?
Mass of Carbonates Needed to Raise Solution pH One Unit, An actual lab titration of a mildly acidic process water at a pH of 4.0 requires 0.9 grams/liter of Na2CO3 to raise the pH from 4.0 to 5.0; re-running the titration but this time using CaCO3..
Choose an acid below and determine how much of the acid in mL that you need to add to 0.800 g of the sodium salt of its conjugate base to prepare a buffer with a pH of 3.8. 3.0 M formic acid
the heat formation of Al2O3(s) is delta H final is -1669 kj/mol. calculate the heat evolved when 0.267 g of Al burns in oxygen
A growth factor for cells was identified from extracts of rat brain. Preliminary characterization was done on this activity using several methods.
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