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A 13 mL sample of a solution of Pb(ClO3)2 was diluted with water to 17 mL. A 15 mL sample of the dilute solution was found to contain 0.027 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
The volume of a certain bacterial cell is 1.60 µm3. What is the volume of 105 cells in liters (L)?
the enthalpy change for melting ice at 0c and constant atmospheric pressure is 6.01 kjmol. calculate the quantity of
an experiment was performed to determine the amount of pyridoxine (B6) in a vitamin tablet. A tablet weighing 0.4006g was dissolved in 25mL of solution
Write a balanced equation for the reduction of ethyl acetoacetate to S(+) ethyl 3-hydroxybutanoate, show stereochemistry
If at a given moment O2 is reacting at a rate of 0.317 mol/L s, what is the rate of formation of H2O?
Assume that all ethanol is transformed into CO2 and assume the lake contains 10^8 liters of water. Explain your answer with the chemical reaction involved and any assumptions you make.
A 28.0-g sample of water at 260. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings
A 0.456 gram sample of an unknown mono protic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
A catalyst decreases the activation energy of a given reaction by exactly 15 kJ/mol. By what factor does the reaction rate increase at 25oC when the catalyst is used. Assume that the Arrhenius pre-exponential factor, A, is the same for the catalyz..
Solution is prepared by mixing 0.025 l of 3e-3 m BaCl2 and 0.025l of 2e-3 m of na2co3. Ksp= 2.6e-9 for baco3. Write balanced equation with correct state
a solution is prepared by dissolving 20.0 g of nai in enoug water to make 300 ml of solution how many moles of ions are
3 tons of ethanol are accidentally discharged into a lake. By how much is the biological oxygen demand of this water increased? Assume that all ethanol is transformed into CO2 and assume the lake contains 108 liters of water.
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