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3. The dissolution of NaCl has a standard enthalpy of +3.87 kJ mol-1 at 25.0ºC and...

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Chemistry

3. The dissolution of NaCl has a standard enthalpy of +3.87 kJmol-1 at 25.0ºC and 1bar. Salt water has 35g/kg salt, and the heatcapacity of sea water is 3993 J kg−1 K−1 at 25.0ºC.

a. (20 pts) How much would water heat up or cool down by addingenough NaCl to make sea water? b. (20 pts) How much heat would bereleased by making 1.00kg of sea water?

c. (20 pts) Assuming that 1.00kg of sea water equals 1.00L involume, how much osmotic work would be required to pump this waterto a final salt concentration of 10mM at 25.0ºC?

Show work and ill rate!

Answer & Explanation Solved by verified expert
3.7 Ratings (559 Votes)
dHdiss positive ie the reaction is endothermic Sea water will cool down when the salt is dissolved Amount of salt in 1kg sea water 35 g 35 g585 gmol1 0598 moles Q msdT where Q heat change m mass of water s    See Answer
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