A chemical engineer studying theproperties of fuels placed 2.223 g of a hydrocar

Question

A chemical engineer studying theproperties of fuels placed 2.223 g of a hydrocarbon in the bomb ofa calorimeter and filled it with O2 gas. The bomb was immersed in1.988 L of water and the reaction was initiated. The watertemperature rose from 19.99 °C to 34.30 °C. If thecalorimeter (excluding the water) had a heat capacity of 420. J/K,what was the heat of combustion of the fuel? (Hint: Enter thecorrect sign.) A chemical engineer studying theproperties of fuels placed 2.223 g of a hydrocarbon in the bomb ofa calorimeter and filled it with O2 gas. The bomb was immersed in1.988 L of water and the reaction was initiated. The watertemperature rose from 19.99 °C to 34.30 °C. If thecalorimeter (excluding the water) had a heat capacity of 420. J/K,what was the heat of combustion of the fuel? (Hint: Enter thecorrect sign.)

Explanation / Answer

We Know that :      The Combustion of hydrocarbongives Carbon-di-oxide and water along with the liberation ofheat.         Q = m s t             = 2.223 gm x 420 J / K x ( 307.3 -292.99 ) K              =  - 13360.6746 J      The Combustion of hydrocarbon releases the energy so it is a exothermicreaction.       

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