5.00 g of molten NaCl is at its melting temperature. The salt is added to 25.00 mL water at 25.0 °C in a coffee cup calorimeter. The salt becomes solid and the temperature of the water increases to 47.9 °C. a) Calculate the amount of heat transferred.

heat absorbed by water = 2.39 KJ

Explanation:

given,

mass of molten NaCl = 5 g

mass of water = 25 g

Temperature of water = 25.0 °C

Temperature increased to = 47.9 °C

heat absorbed by water = m S ΔT

S is specific heat in J/gm °C

Specific heat of water = 4.184 J/gm °C

m is mass of water

heat absorbed by water = 25 x 4.184 x (47.9-25)

= 25 x 4.184 x 22.9

= 2395.34 J

heat absorbed by water = 2.39 KJ