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If 105 mg 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 nurse requires to prepare 125.0mL of normal saline to dissolve drugs that are to be administered IV. Normal saline is 0.92% (m/v) NaCl. Explain how many grams of NaCl will the nurse need
What volume of {\rm HCl} solution with a {\rm pH} of 1.0 can be neutralized by 1 dose of milk of magnesia. (Assume two significant figures in your calculations.)
Nicotine is responsible for the addictive properties of tobacco. Assume Kb1= 1.05 x 10^-6 and Kb2= 1.32 x 10^-11. Determine the pH of a 0.00120 M solution of nicotine.
dr. browns new house will need to use propane c3h8 gas to fuel the range because natural gas service is not available
Problem- The pKa of acetic acid, CH3COOH, is 4.74. A buffer solution was made using an unspecified amount of acetic acid and 0.30 moles of NaOOCCH3 in enough water to make 1.50 L of solution. The pH of the solution is 4.55. How many moles of CH3CO..
When 0.633 L of Ar at 1.20 atm and 227°C is mixed with 0.185 L of O2 at 501 torr and 127°C in a 400 mL flask at 27°C, what is the pressure in the flask
The value of delta H for 2CO(g) + O2 (g) = 2CO2(g) is -482 kJ. Calculate the heat released to the surroundings when 38.5 g of O2 (g) reacts with excess CO
Determine the mass of sodium hydroxide produced when 0.47g of sodium nitrite reacts with water according to the following equation:
1)At what velocity (m/s) must a 20.0 g object be moving in order to possess a kinetic energy of 1.00 J
Problem- A cubic block of phosphorus pentabromide, PBr5, with sides of 3.76cm weights 186.6g. Has a density of what?
Lead is a toxic metal that affects the central nervous system. A Pb contaminated water sample contains 0.0012 % Pb by mass. Q) How much of the water (in mL) contains 160mg of P}? (Assume a density of 1.0 mg/mL)
You plan to marinate a piece of beef for your dinner. The beef is 5 by 6 inches with the thickness of 1 inch. You rub salt and pepper all around it, and set it aside for 30 minutes. Then you checked it after 30 minutes and found that the beef tast..
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