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Fluorine-18 undergoes positron emission with a half-life of 1.10 x 102 minutes. If a patient is given a 248 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83 mg? (Assume that none of the fluorine is excreted from the body.) Please show all your to get good ratings
a solution is made by mixing 20.0 mL 0.4 M NaCH3COO with 30.0 mL 0.4 M CH3COOH, calculate the pH? For acetic acid, Ka = 1.76 x 10-5.
How many moles of solute are present in each of the following solutions. (a) 145mL of 0.25M NaHCO3 (b) 631.0mL of 2.25M H2SO4
Complete combustion of 4.80 g of a hydrocarbon produced 14.7 g of CO2 and 7.02 g of H2O. What is the empirical formula for the hydrocarbon?
calculate the escape velocity the minimum initial velocity that will take an object to infinity from the surface of a
calculate the molar concentration of OH- ions in an 0.85M solution of hypobromite ion, BrO- (Kb = 4.0x10^-6). what is the pH of this solution?
An additional 31.4 g of water was added to the reaction vessel, and a new state of equilibrium was achieved. What are the equilibrium partial pressures of each gas in the mixture
Identify the alkaline Earth metal. Express your answer as a chemical formula. Write the formula for the metal hydride. Express your answer as a chemical formula.
when formic acid is heated it decomposes to hydrogen and carbon dioxide in a first order decay calculate the partial
Describe using chemical reactions how Oxone keeps swiming pool water clean (i.e. what would happen to the solubility of organic materials such as algae when treated with Oxone
It takes 54.0 J to raise the temperature of an 11.7 g piece of unknown metal from 13.0C to 25.0C}. What is the specific heat for the metal?
A mixture of .220 moles CO, .350 moles H2 and .640 moles He has a total pressure of 2.95 atm. What is the pressure of CO
A rare gold coin (24 karat, or 100% gold) has a mass of 25.54 g. How many atoms of gold are present in this coin
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