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Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of 15.0 hours. A sample of sodium-24 with an inital mass of 13.0 g was stored for 45.0 hours. How many grams of sodium-24 is left in the sample after 45.0 hours?
Explain a solution is prepared by dissolving 57.87 grams of NaCl in enough water to make 2525mL of solution. Explain what is the molarity of the solution
What is the minimum number of conversions that need to be done across a peak to achieve a reproducibility (relative standard deviation) of less than 1% for repeated measurements of the same peak
Determine the rate of heat transfer to the heat engine if both devices are reversible and all of the power output from the heat engine is used to supply the refrigerator
Problem- The molar heat of vaporization for benzene is 7.3 kcal/mol. How many calories are required to vaporize 425g of benzene at its boiling point
Write one overall equation, using an alkali metal ion and a nitrate ion as spectator ions if needed, for the following net ionic equation: H+(aq) + OH-(aq) ? H2O(l)
predict the formula of a compound that presumably would result from the reaction between magnesium and topaline, and name the compound.
For the acid-base titration combination of NaOH with 1.5 mol HCl, find the number of moles of NaOH that would be the chemically equivalent amount of HCl. Answer in units of mol.
Calculate the potential of each electrode relative to a standard hydrogen electrode at 25 degree C. Predict the chemical reactionthat will occur when these two electrodes are connected and a salt bridge is used to join the two solutions together.
The distance between the floors is 7.60 m. What is Stewart's energy conversion efficiency if he does not lose any weight during the climb?
What is the purpose of the hydrochloric acid and the sodium acetate in this reaction
A buffer solution is.290M in a weak base with kB of 2.8*10-5 as well as .490M in the conjugate acid what is the pH
If the formation of magnesium nitride is not taken into account and the gray residue after the initial heating is assumed to be wholly magnesium oxide, the experiment would take mush less time.
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