Question

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.

Answer 1

Answer:

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

Answer 2

The amount of heat transferred is 2.39 KJ.

What is Heat?

This is the form of energy which is transferred from one body to another as the result of a difference in temperature.

Parameters

mass of molten NaCl = 5 g

mass of  water = 25 g                    

Temperature of water = 25.0 °C

Final Temperature of water = 47.9 °C

Specific heat of water = 4.184 J/gm °C

Heat = m S ΔT

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

= 25 x 4.184 x 22.9 = 2395.34 J

= 2.39 KJ.

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