1. Determine the molality of a solution prepared by dissolving 4.95 g of potassium chloride in 70 g of water. Enter your answer to 2 decimal places
2. Determine the molality of a solution of benzene dissolved in toluene (methylbenzene) for which the mole fraction of benzene is 0.132. Give your answer to 2 decimal places.
3. How many moles of solute particles are present in 7.89 mL of 0.458 M K2SO4? When you have your answer, take the LOG (base 10) of your answer and enter it with 2 decimal places.
molality = number of moles of solute/mass of solvent in kg
molar mass of kcl=74.55g
so 1mole kcl = 74.55 g of kcl
so 4.95 g of kcl= [1mol/74.55 g]*4.95=0.066 mols
mass of water = 70g= 0.07kg
molality= 0.066/0.07 kg =0.94 m
1. Determine the molality of a solution prepared by dissolving 4.95 g of potassium chloride in...
1. An aqueous solution of potassium thiosulfate is prepared by dissolving 3.70 g of potassium thiosulfate in 7.11×102 g of water. The density of the solution is 1.37 g mL-1. a) Determine the mass percent of potassium thiosulfate in the solution. b) Determine the mole fraction of potassium thiosulfate in the solution. 2. An aqueous solution of potassium bromide is prepared by dissolving 8.75 g of potassium bromide in 8.29×102 g of water. The density of the solution is 1.20...
Determine the molality and mole fraction of sucrose if a solution is prepared by dissolving 100.6 g of table sugar (sucrose, C12H22O11) in 985 g of water
What is the molality of a solution prepared by dissolving 30.57 g of iron (III) chloride in 284.7 g of water? Report your answer to THREE significant figures.
A solution is prepared by dissolving 16.2 g of benzene (C6H6) in 282 g of carbon tetrachloride (CCl4). The density of the solution is 1.55 g/mL. The molar masses of benzene and carbon tetrachloride are 78.1 g/mol and 154 g/mol respectively. What is the mass percent, mole fraction, molarity and molality of the benzene?
Calculate the molality of a dextrose (mw = 180.16 g/mole) solution prepared by dissolving 52.8 g dextrose in 500 mL of water (density of the solution is 1.06).
Determine the molarity of a solution of potassium chloride that is prepared by dissolving 1.4753 g of KCl in a 100-mL volumetric flask and filling it to the calibration mark with deionized water. Use a molar mass with at least 4 significant figures so that the number of SF in the calculated molarity is not limited. Show all calculations (including labeled conversion factors) and express the answer with the appropriate number of significant figures. According to the manufacturer, the volume...
Determine the molality of a solution of ethanol dissolved in water for which the mole fraction of ethanol is 0.246. Give your answer to 2 decimal places
Determine the molality of a solution of methanol dissolved in ethanol for which the mole fraction of methanol is 0.417. Give your answer to 2 decimal places.
A. Determine the molality of a solution made by dissolving 42.6 g of CH3OH in 716 g of H2O. Answer:_____m CH3OH B. Determine the molality of a solution made by dissolving 0.568 moles of (NH4)2CO3 in 3366 g of H2O. Answer:_____m (NH4)2CO3 C. Determine the molality of a solution made by dissolving 0.519 moles of CH3OH in 746 g of ethanol. Answer:___m CH3OH
What is the molality of a solution prepared by dissolving 300 g KCl in 225 g H2O? Show all calculations and report your answer to the correct number of sig figs.