A calorimeter contains 31.0 ml, of water at 150 °C. When2 50 g of X (a substance

Question

A calorimeter contains 31.0 ml, of water at 150 °C. When2 50 g of X (a substance with a molar mass of 60 0 g/mol is added, it dissolves via the reaction X(s) + Ho(0)X(a) and the temperature of the solution increases to 300 °C Calculate the enthalpy change, for this reaction per mole of X Assume that the specific heat of the resuliting solution is equal to that of water 14 18 J/(g°C) calorimoter tself, nor to the surroundings. Express the change in enthalpy in kilojoules per mole to three significant figures. View Available Hint(s) that density of water is 1,00 g/mL, and that no heat is kost to the k.J/mol Submit

Explanation / Answer

Q=mcDeltaT

Q is enthalpy change delta H

Mass =1g/ml*31=31 g

DeltaH=31*4.18*(30-15)=1943.7 J

=1.944 kj

Then number of mole of X

=2.5/60=0.042 mole

Then the total enthalpy change in X mole is

1.944/0.042 =46.29kj/mol

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