In a sealed container, 25 g of ice at 0 degrees Celsius is heated to 25 g of wat

Question

In a sealed container, 25 g of ice at 0 degrees Celsius is heated to 25 g of water at 26 degrees Celsius. Calculate the change in enthalpy for the process. Which of the following is the correct answer
A. 11 kJ B. 8.4 kJ C. 14 kJ D. 58 kJ In a sealed container, 25 g of ice at 0 degrees Celsius is heated to 25 g of water at 26 degrees Celsius. Calculate the change in enthalpy for the process. Which of the following is the correct answer
A. 11 kJ B. 8.4 kJ C. 14 kJ D. 58 kJ
A. 11 kJ B. 8.4 kJ C. 14 kJ D. 58 kJ

Explanation / Answer

0 --------------------> 26 oC

two heat conversions

1 ) heat of fustion :

Q1 = mass x delta Hfusion

     = 25 g x 333.55 J / g

    = 8338.8 J

Q2 = m Cp dT

Q2 = 25 x 4.184 x (26-0)

Q2 = 2719.6 J

total heat = Q1 + Q2

                = 11058 J

change in enthalpy = 11.0 kJ

answer : A)

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