10.1 g CaO is dropped into a styrofoam coffee cup containing 157 g H2O at 18.0°C. If the following reaction occurs, then what

Question

10.1 g CaO is dropped into a styrofoam coffee cup containing 157 g H2O at 18.0°C. If
the following reaction occurs, then what temperature will the water reach, assuming that the cup
is a perfect insulator and that the cup absorbs only a negligible amount of heat? [specific heat of
water = 4.18 J/g °C]
CaO(s) + H₂O(l)→ Ca(OH)₂(s)      = -64.8 kJ/mol
A. 18.02°C
B. 117°C
C. 35.8°C
D. 42.2°C
E. 311°C

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