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Question- The half life of potassium-40 is 1.26X10^9 yrs, if the natural abundance of k-40 is .010% and 3500 disinigrations of k-40 occur every 10 sec in a human body weighing 100kg then what is the concentration of potassium (include all isotopes) in that body? Assume the density of the human body is 1.0g/mL since it is made mostly of water.
A solution consisting of .200 mol of methylbenzene (C6H5CH3) in 250 g of nitrobenzene (C6H5NO2)freezes at .40 degrees celsius
Write the equation for the reduction half-reaction. If the potential of the silverIsilver ion electrode (E AgIAg+) is taken to be 0.000 V, what is the value of the potential for the oxidation reaction?
Explain what pressure of carbon dioxide is necessary to keep the carbon dioxide concentration in a bottle of club soda at 0.35 M at 25 degrees Celsius
0.101 M HNO2 solution contains 0.0067 M H+ ions at 25 oC. What is the percent ionization of this acid under these conditions
Consider the four polysaccharides amylose, spartylose tarhylose and ranylose. Amylose is the unbranched polymer of a-(1Ã 4) linked glucose molecules found in starch, while spartylose, tarhylose and a Blue Devylosea
What volume of hydrogen gas at STP is required for the complete reaction of 50.0 g of nitrogen in the following reaction? N2(g) + 3 H2(g) ? 2 NH3(g)
Calculate the enthalpy change for the reaction, assuming that the solvation enthalpies of the sugars are negligible. Draw an energy profile for the overall process.
if we have a solution that contains 0.022 m calcium and 0.014 magnesium and we have to use potassium hydroxide to
Calculate E cell for the following balanced redox reaction O2(g)+2H2O(l)+4Ag(s)=4OH^-(aq)+4Ag^+(aq)
a gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of 1.20 atm. If helium added to the mixture increases the pressure
Assuming your sample of cereal is 10.00 grams and a recommended serving of cereal is 30.00 grams, how many mg of iron would you expect to extract from your sample
Question- I performed an experiment to study the electrochemical cells and reduction potentials. I have to complete the following- 2) Sketch an apparatus that could be used to study the reaction shown in the following equation
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