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(1) Each of the following isotopes is used in medicine. Indicate the number of portons and neutrons in each isotope: (a) phosphorus -32, (b) chromium -51, (c) cobalt -60, (d) technetium -99, (e) iodine -131, (f) thallium -201.
(2) Rubidium has two naturally occurring isotopes, rubidium -85 ( atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium -87 (atomic mass = 86.9092; abundance = 27.85%). Calculate the atomic weight of rubidium.
A mixture of a, b, and c gives three peaks in the GC with relative areas of 1:5.5:7.8, What is the percent composition of the mixture. (a walktrhough would be helpful)
A sports-ultility vehicle has an average mileage rating of 18 miles per gallon. How many galllons of gasoline are needed for a 397-mile trip
Assume the H atom oscillates toward and away from the I atom and that force constant of the HI bond is 314 N m^-1 , bond is 161pm. calculate (a) vibrational frequency of the molecule and (B) the wavelength required to excite the molecule into vibr..
Based on the standard reduction potential, which species is oxidized when current is allowed to flow? B. Calculate the value of Q, the reaction quotient, for this cell reaction. C. Calculate the actual cell potential at 25 degrees C.
What is the energy of a photon of light that has a frequency of 3.09 x 1018 Hz? You might need to know that c = 3 x 108 m/s and h = 6.63 x 10-34 Js.
Which term is used to describe mechanism of reaction of 4-methy-2-pentene with sulfuric acid and water as a solvent to produce pantanol. a)tertiary carbanion b)2-methylpentoxonium c)sp hybridized pentyne d)vicinal dihydroxide e)hydroxide ion
Draw the structure of oxaloacetate and clearly show which carbon atoms are 14C and which are 13C labeled. Draw a box around your answer.
The combustion of propane illustrated by the following reaction releases 2428 KJ per mole of reaction. A sample of propane is burned at 59 degrees celsius and 746 mm Hg. The process produces 39.7 L of CO2(g). How much heat was released?
A patient needs to take 625 of ibuprofen twice daily. The pills in the bottle are each 250. . How many pills does the patient need to take each time she wants the 625 dosage? Assume that these pills are scored and can be cut in half if necessary.
Express the rate of the following reaction equation in terms of the rate of concentration change for each of the three species involved: 2NOCl (g) = 2NO (g) +Cl2 (g)
The calorimeter and water absorb 21.9 kJ of heat. How much heat is given off when one mole of salicylic acid burns
Calculate the activity and activity coefficient for ethanol in this solution. c. Calculate ?mixG for a solution that contains 0.12 moles of ethanol and 0.83 moles of chloroform at 35.0 oC.
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