# test2 - of water what is the vapor pressure of the...

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Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula . The radiator fluid used in most cars is a half-and-half mixture of water and antifreeze. What is the freezing point of radiator fluid that is 50% antifreeze by mass? for water is 1.86 . C2H6O2 molar mass = 62.07 grams / mole moles of C2H6O2 for 1kg of this there is 1 kg for water --------- 1000 grams C2H6O2 @ 1 mole / 62.07 grams = 16.11 moles per 1000 grams of solvent ) ie 16.11 molal) --------------- freezing point depression = 16.11 molal (1.86 C/molal)= 29.97 celsius drop in freezing point first ANSWER= -30. celsius What is the boiling point of radiator fluid that is 50% antifreeze by mass? Kb for water is 0.512C/m boiling point elevation = 16.11 molal (0.521 C/molal)= 8.39 celsius SECOND ANSWER = 108 celsius 10.a If the methane contained in 4.50 of a saturated solution at 25 was extracted and placed under STP conditions, what volume would it occupy? If 0.840 of a nonvolatile nonelectrolyte are dissolved in 3.90

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Unformatted text preview: of water, what is the vapor pressure of the resulting solution? The vapor pressure of pure water is 23.8 at 25 . answer: 3.9/(.840+3.9)=.8228 .8228*23.8= 19.6 Torr' Part. B. A solution is composed of 1.60 cyclohexane ( ) and 2.10 acetone ( ). What is the total vapor pressure above this solution? '-answer: Pa= 1.6/(1.6+2.1)=.4324 , .4324 *97.6 = 42 torr Pb = 2.1/(2.1+1.6)=.567 , .567* 229.5 = 130 torr 42 +130 =172 torr As you saw in Part B, the vapor above the cyclohexane-acetone solution is composed of both cyclohexane vapor and acetone vapor. What mole fraction of the vapor above the solution, , is cyclohexane? answer: 42/172 = .245 How many liters of water are required to dissolve 1 gram of calcium phosphate? ANSWER:1 gram/3.41 X 10^-5 grams/liter grams cancel and the answer is in liters . .. = 0.2933 x 10^5 liters = 2.933 X 10^4 liters =29,330liters Proof (2.933 x10^4 liters )( 3.41 x10^-5grams/liter) = 10.001 X 10^-1 = 1.001 grams Source(s): Ph.D.Biochem BS Chem...
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test2 - of water what is the vapor pressure of the...

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