A solution is saturated in O2 gas and KNO3 at roomtemperature. What happens if the solution is warmed to75  C?(a) Solid KNO3 precipitates out of solution.(b) Gaseous O2 bubbles out of solution.(c) Solid KNO3 precipitates out of solution and gaseousO2 bubbles out of solution.(d) Nothing happens (both O2 and KNO3 remain insolution).

The weight percent %W/W of a saturated solution of potassium chloride in 200CO was: (NOTE: the solution contain 298g/L and D=1.17g/cm3) * 40.66%W/W W/W% 75.20 W/W% 25.47 10.54%W/W

A mixture containing acetone (C3H6O) and chloroform (CHCl3) is prepared in which the mole fraction of chloroform is 0.4297. The partial molar volumes of acetone (A) and chloroform (C) for this mixture are mL mol VA = 74.166 mL Vc = 80.235 mol (a) What is the number of moles of each component and the volume (in mL) of the mixture if it has a total mass of 278.0 g? (b) What is the volume of the unmixed components of this mixture (in mL) if their individual molar volumes (in pure form) are V (acetone) = 73.993 V (chloroform) = 85.665 Does the total volume of the materials expand or contract upon mixing? mL mol mL mol

(ans: -7.50 x 10 ) one mole of sucrose). Imol %3D 9reaction=n AH %3D %3D (ans: -5.64 x 10 kJ/mol) Calcium chloride and sodium hydroxide react according to the equation: CaCl(aq) + 2 NaOH(aq) → Ca(OH),(s) +2 NaCl(aq) What volume of 2.00 M NaOH would be needed to react with 50.0 mL of 1.50 M CaCl,? a, 017 (ans: 75.0 mL) b) When 50.0 mL of 1.50 M CaCl, solution and 80.0 mL of 2.00 M NAOH solution (i.e., 5.0 mL more than calculated in part (a)) both initially at 22.3°C are mixed in a coffee-cup calorimeter with a calorimeter constant of 12.8 J/ C, the temperature fell to 20.0°C. If the density of the reaction mixture is 1.03 g/mL and its specific heat 3.94 J/g°C, calculate the heat absorbed hv the reaction. (ans: 1.24 x 103) c) Calculate AH (in kJ per mole of Ca(OH)2 formed) for the reaction. (ans: 1.6 x 10' kJ/mol)

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