2 moles of a compound are allowed to react ina foam coffee cup that contains 113

Question

2 moles of a compound are allowed to react ina foam coffee cup that contains 113 grams of water. Thereaction caused the temperature of the water to rise from 21 to24.7 degrees Celsius. What is the enthalpy of this reaction? Assumethat no heat is lost to the surrounding or to the coffee cupitself. 2 moles of a compound are allowed to react ina foam coffee cup that contains 113 grams of water. Thereaction caused the temperature of the water to rise from 21 to24.7 degrees Celsius. What is the enthalpy of this reaction? Assumethat no heat is lost to the surrounding or to the coffee cupitself.

Explanation / Answer

In this case, all the change of enthalpy of reaction is absorbed bywater as heat (Q). Q=mcT, m= mass, c= specific of water, T= change oftemperature thus, Q= (113 g)*(4.179J/(g*°C))*(3.7°C)    =1747.24J    =1.74724KJ H=1.74724KJ/ 2 moles =0.874 KJ/mole

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