Reference no: EM13184407
23. A 0.116M ionic solution has an osmotic pressure of 7.8atm at 38?C.
A. Calculate the van't Hoff factor (i) for this solution.
24. Calculate the vapor pressure at 25 ?C of an aqueous solution that is 5.80% NaCl by mass.
25. Potassium perchlorate (KClO4) has a lattice energy of -599 kJ/mol and a heat of hydration of -548 kJ/mol.
A. Find the heat of solution for potassium perchlorate when 10.5g of potassium perchlorate is dissolved with enough water to make 104.9mL of solution.
B. Determine the temperature change that occurs when 10.5g of potassium perchlorate is dissolved with enough water to make 104.9mL of solution. (Assume a heat capacity of 4.05 J/g??C for the solution and a density of 1.05 g/mL.)
26. A saturated solution was formed when 5.85×10?2L of argon, at a pressure of 1.0 atm and temperature of 25 ?C, was dissolved in 1.0 L of water.
A. Calculate the Henry's law constant for argon.
27. An aqueous solution contains 11.4% NaCl by mass
A. What mass of water (in grams) is contained in 2.9L of the vapor above this solution at 55 ?C? The vapor pressure of pure water at 55 ?C is 118 torr. (Assume a van't Hoff factor of 1.9 for NaCl.)
28. What is the freezing point of an aqueous solution that boils at 105.8?C?
30. A solution is prepared from 4.5729g of magnesium chloride and 43.244g of water. The vapor pressure of water above this solution is found to be 0.3628atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
A. Find the value of the van't Hoff factor i for magnesium chloride in this solution.
|
State what is the molecular weight of the material
: After running the reaction for some time, we collect the product and find a total of 3.1 x 10-3moles of COOH groups. What is the molecular weight of the material? Extent of reaction?
|
|
What important function of money does a statement disregard
: Functions of Money) "If an economy had only two goods (both nondurable), there would be no need for money because exchange would always be between those two goods." What important function of money does this statement disregard. Suppose the money ..
|
|
Define what is the estimated temperature of the object
: What is the estimated temperature of the object using the above approximate prescription? what is the percent error?
|
|
State what is the pressure of the gas
: If the barometric pressure is 741 mmHg, and if h = 53. 0 mm, what is the pressure of the gas, expressed in atm and in kilopascals, if the substance in the tube is mercury having a density of 13.6 g/mL.
|
|
The vapor pressure of pure water in magnesium chloride
: A solution is prepared from 4.5729g of magnesium chloride and 43.244g of water. The vapor pressure of water above this solution is found to be 0.3628atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
|
|
Calculate the total projected sales for the quarter
: Calculate the total projected sales for the quarter and At the local ice cream shop, there's a sign posted that reads, "If you don't receive a receipt, your next ice cream is free!" Is this an internal control procedure? If so, how does it work?
|
|
Compute the vapor pressure of water
: Calculate the vapor pressure of water above this solution at 338 K. The vapor pressure of pure water at this temperature is 0.2467 atm
|
|
Compute the percent by mass of zinc
: Calculate the percent by mass of zinc in the post-1982 pennies using following information: the total mass of each penn is 2.500 g, the density of copper is 8.96 g/mL
|
|
Indicate how the banks balance sheet would be altered
: ppose that the reserve requirement is 10 percent and the balance sheet of the People's National Bank looks like the accompanying example. A. What are the required reserves of People's National Bank Does thebank have anyexcess reserves B. What is th..
|