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Question- The half life of potassium 40 is 1.26*10^9 years. if the natural abundance of K 40 is 0.010% and 3500 disintegration of K 40 occur every 10.0sec, in human body weighing 100kg,then what is the concentration of potassium in clued all isotopes in that body? Assume density of human is 1g/ml
If possible just a to the point details about how you got the answer?
What volume does the beaker hold? Use d =1.00 g/mL as the density of water answer in mL B)How much would the beaker and its contents weigh if it was completely filled with mercury?
Another student was in a hurry and stopped heating, even though bubbles were still emerging from the rubber tubing. 3.) A student used the measure of Flask no.1 to be 250mL, without measuring the volume as directed
Explain how many possible trisubstituted derivatives C6H3X2Y can be obtained from the para disubstituted benzene C6H4X2. Overlook directive effects of the substituents X and suppose that all positions on the ring are accessible to the reagent Y+.
A solution containing 100g of unknown liquid and 900g water has a freezing point of -3.33C. Given Kf=1.86C/m for water, determine the molecular weight of the unknown liquid and express your answer in g/mol.
Compute the Spectral radiance for a blackbody at 2500 K for the wavelength range 4500 angstroms to 4500 + 10 angstroms
If the concentration of fluoride in fluoridated drinking water is 1 x 10 ^-5 M and the calcium ion concentration in blood is 2.5 x 10^ -3 M, why is there no danger of CaF2 precipitating in the blood stream, after drinking the water?
a sol. of unknown calcium concentration is titrated using edta. the edta is first standardized against a primary
A unit of heat energy that was formerly used frequently was the calorie (cal). Calculate the calorimeter constant for the coffee-cup calorimeter in terms of cal/g degrees C.
In our kinetics lab we used sodium thiosulfate as a mild reducing agent. Explain why this reagent would be a reducing agent. Also, what about potassium dichromate K2Cr2O7. Why is it such a good oxidizing agent.
A 29.0-g sample of water at 260. K is mixed with 48.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
What are the advantages and disadvantages of using simple distillation vs fractional distillation methods. (in terms of gas chromatography)
If you fill the larger tank with oxygen to a pressure of 135 , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
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