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lead on leaves by a roadside was measured spectrophotometrically by reaction with dithizone. The standard deviation for a triplicate analysis was 2.3 ppm. What is the 90% confidence limit?
if you have 310 mL of water at 25 degrees celsius and 110mL of water at 95 degrees celcius, what is the final temperature of the mixture?
Consider the following reaction: 2A + B → 3C + D If 63.0 mol A and 42.0 mol B react to form 54.0 mol C. What is the percent yield of this reaction.
Mg + 2 HCL -> MgCl2 + H2 What volume of hydrogen at STP is produced from the reaction of 50.0 g of Mg and the equivalent of 75 g of HCl?
Calculate the pH during the titration of 32 mL of 1.149 x 10-1 M NaOH with 1.161 x 10-1 M HBr solution after the following additions of acid.
A 2.0 L tank at 298 K contains oxygen gas with a partial pressure of 3.8 atm and helium gas with a partial pressure of 5.2 atm.
2 K + Cl2 ---> 2 KCl How many grams of KCl is produced from 2.50 g of K and excess Cl2. From 1.00 g of Cl2 and excess K?
Draw the structure of the carbocation intermediate leading to the formation of 3-methyl-1-butene. Use the (+) and (-) tools to adjust charges as necessary
The Ksp for Al(OH)3 is 2 x 10-32. At what pH will a 0.2 M Al3+ solution begin to show precipitation of Al(OH)3.
Enough Al2(SO4)3 solid is added to water to prepare 100.0 mL of a 0.150 M solution of aluminum sulfate. What is the concentration of sulfate ion in solution?
Suppose that 160 g of ethanol at 30?C is mixed with 230 g of ethanol at 76?C at constant atmospheric pressure in a thermally insulated vessel.
C2H6+O2 ---> CO2+H2O Calculate the mass of H2O that should form if 1.5 g of C2H6 is combusted in the presence of 2.5 g of O2.
It is then restored to its original state by the extraction of heat at constant pressure. Calculate w for each step and for the total process. What values for w would you calculate if the cycle were traversed in the opposite direction?
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