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The pH of a Ba(OH)2 solution is 10.66 at25 oC. What is the hydroxide ion concentration of this solution? If the solution volume is 250. ml, how many grams ofBa(OH)2 must have been used to make this solution?
A 100.0 mL sample of cold water at 21.3 C was added to a 75.0 mL sample of hot water at 55.1 C. Calculate the temperature of the warm water mixture.
A student performing a lab experiment obtained 2.120 g of alum for .480 g of Al metal. a. calculate theoretical yield. calculate percentage yield
A 29.20 g piece of iron and a 25.30 g piece of gold at 100.0 degree C were dropped into 980.0 mL of water at 15.65 degree C. The molar heat capcities of iron and gold are 25.19 J/(mol degree C) and 25.41 J/(mol degree C), respectively.
A hazardous waste incinerator has been burning a certain mass of dichlorobenzene (C6H4Cl2) per hour, and the HCl produced was neutralized with soda ash (Na2CO3).
What is the composition in mole fractions of a solution that has a vapor pressure of 39 at 20 ? Express your answer using two significant figures.
Use the density of copper (8.95 g/cm3) and its molar mass (63.55 g/mol) to calculate an approximate atomic radius for copper.
What alkene (including cis and trans isomers) would be produced by the dehydration of the following alcohols? Where possible, predict the relative amounts of each product according to Zaitsev's rule. a. 3-pentanol b. 2-methyl-2-butanol c. 1-butano..
Calculate the mass of HONH2 required to dissolve in enough water to make 250.0 ml of solution having a pHof 10.00 (Kb=1.1*10 (-8).
2NOCl(g) = 2NO + Cl2 When 3.00 mol of NOCL is heated to a given temp. in a 2.00 L container, 1.70 fol NOCL remain at equilibrium. a.) Calculate the equilibrium concentration of each substance in the reaction
Then use the estimate to calculate the heat of formation of ethanol from the heats of formation (in KJ/mol) of CO2: -?394, and H2O: -?242.
The Ksp of magnesium carbonate is 4.0x10-5. write balanced chemical equations and Ksp expressions for each of the salts as part of your solution
Assuming complete dissociation, what is the molality of an aqueous solution of KBr whose freezing point is -2.95 degrees celsius . water freezing point 1.86
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