When a 13.0-g sample of NaOH(s) dissolves in 400.0 mL water in a coffee cup calorimeter, the temperature of the  water changes from 22.6°C to 30.7°C. Assuming that  the specific heat capacity of the solution is the same as  for water, calculate (a) the heat transfer from system to  surroundings and (b) DH for the reaction  NaOH(s) : Na+(aq) + OH– (aq)

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