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When a 6.39 g sample of solid sodium hydroxide (molar mass 40.00
g/mol) dissolves in 100.0 g water in a coffee cup calorimeter, the
temperature rises from 21.6 to 37.8 °C. Calculate AH (in kJ/mol NaOH)
for the solution process. Assume that the specific heat of the solution is
the same as that of pure water. (Use three significant figures; do not
include units.)