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A 269 mg sample of rock was found to have 2.45 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.45 × 10-6 mol of argon-40. How old was the rock? (Hint: What assumption is made about the origin of the argon-40?). Enter your answer in scientific notation:
Sketch the line-bond structure for each molecule or polyatomic ion of the following. Designate the formal charges where applicable.
Explain the large disparity in the numerical results pf Part (a). Discuss the advantages and disadvantages of the three energy sources.
A 370. mL air sample collected at 35°C has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 49°C.
Calculate the formula weight of CuSO4 . Use the following atomic weights: Cu is 63.5463 g/mol, S is 32.0666 g/mol, and O is 15.99943 g/mol. Your reported answer should have the correct number of significant figures and units.
A reaction inside a cylindrical container with a movable piston causes the volume to change from 14.0L to 21.0L while the pressure outside the container remains constant at 0.975 atm.
what is the cell potential at 25 ?C if the concentrations are [Co3+]= 0.852M , [Co2+]= 0.545M , and [Cl?]= 0.313M and the pressure of Cl2 is PCl2= 6.10atm
What is the molarity of a sodium chloride solution, if 6.62 g of NaCl are dissolved in enough water to make
For an aldol reaction, the key step is the attack on the partially positive carbonyl carbon by a nucleophile. Rank benzaldehydes by their reactivity in an aldol reaction.
Draw the chemical structure ( including all atoms and bonds) for the compound with the systematic name:6,7-dichloro-5-methyl-4-transaminophenyl-cis-2-heptane-ol
.134 mol of KCl and .230 mole of CaCl2 were dissolved in water. Calculate the total of number of moles of Cl- of ions in the solution ?
Assume the van der Waals equation of state holds for the n-propane molecule (C3H8). Find values for the constants a and b (online) and use these to calculate the density in (g ml^-1) at a temperature of 1000K and a pressure of 10 atm
what mass of ammonium chloride can be added to 100 grams of water at 20 degrees celcius before the solution becomes saturated?
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