b hc pil uie soid wnl Helt lt c) The solid phase is more dense than the liquid p
ID: 586866 • Letter: B
Question
b hc pil uie soid wnl Helt lt c) The solid phase is more dense than the liquid phase. The liquid phase is more dense than the solid phase. 9. Which one of the following has the lowest vapor pressure at 25°C? a) CH3OH b) CH CH20H c) CH:OCHs d) HOCH2CH2OH 10. Calculate the enthalpy change upon converting 18.02 g of ice at -25°C to water at 85°C at 1 atm. The following information may be useful: specific heat of H20(s) is 2.09 J g'deg specific heat of H20(D) is 4.18 J g deg specific heat of H20(g) is 1.84 J g'deg heat of fusion for water is 6.01 kJ/mol heat of vaporization for water is 40.67 kJ/mol a) 7344J b) 7350 J c) 9770J d) 13,354 J e) 112,000JExplanation / Answer
9. The one having lowest vapor pressure at 25 oC is,
d) HOCH2CH2OH
Low vapor pressure means high boiling point
10. Enthalpy change
ice at -25 oC to 0 oC
dH = mCpdT = 18.02 x 2.09 x -25 = 942 J
ice at 0 oC to water at 0 oC
dH = mdHf = 18.02 x 6010/18 = 6017 J
water at 0 oC to 85 oC
dH = mCpdT = 18.02 x 4.18 x 85 = 6403 J
Total enthalpy change = 13362 J
Answer,
d) 13,354 J
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