Question

7.2 g Pb 7.2 mg Pb 106 g sln L sln oblems 3-6: 3) A solution should be prepared as 3.56 M calcium chloride, CaCl2. Calculate mass (b) of the VOI solute that is needed in order to prepare 3500 mL of the solution. 3.56M CaCl2 mois. -= 12.46mols 3.5L - mol 12.46 molsy 110. agu Imol = 1382.86 11400g (4) A solution is prepared by dissolving 65 g of ethyl alcohol (density=0.78 g/mL) in 2.35 L of water. (ethyl alcohol formula: CH3CH2OH). Assume that volumes of both solute and solvent are additive which means there is no net change in volume when the two volumes are mixed. The total volume is simply the sum of individual volumes mixed together. a. Calculate the solute concentration in percent (by volume) units. 65g To I 46.07g 1.41089 mois =.60038 M 2.35L
i cant seem to get #4/5

Answer 1

1 AC 3 We know that the molarity (M) is given by the formula, molarity (M) = No of moles of the solute volume of the solution in litre 1 3.56 M = No of moles of cace, ImL = - 3.5 L No of moles of calls = 3:56MX 3:52 . 3 3.56 modly. * 3.5 C M = moi)L) : 1246 mol са и 2 formula, tre know that the no op moles of a substance is given by the No. of moles of a substance = Mass of the substance .. ! Molar mass of the substance ... Mass of Call, = No of moles of each x molar mass of call = 12:46 mol x 110:98 ģimox. 138218 g . Mass of the solete is 138218 g ( Answer) :