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Author Question: Ethanol (C2H5OH) melts at -114 C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of ... (Read 101 times)

RYAN BANYAN

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Ethanol (C2H5OH) melts at -114 C. The enthalpy of fusion is 5.02 kJ/mol.
 
  The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K, respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135 C to liquid ethanol at -60 C?
  A) 207.3
  B) -13.3
  C) 6.34
  D) 3617
  E) 8.63

Question 2

The normal boiling point of methanol is 64.7 C and the molar enthalpy of vaporization if 71.8 kJ/mol. The value of S when 1.75 mol of CH3OH (l) vaporizes at 64.7 C is ________ J/K.
 
  A) 0.372
  B) 4.24  107
  C) 372
  D) 1.94  103
  E) 1.94


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RYAN BANYAN

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Reply 2 on: Aug 27, 2018
Wow, this really help


debra928

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Reply 3 on: Yesterday
Excellent

 

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