NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    Gasoline has an enthalpy of combustion 24000 kJ/ gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from \[25{}^\circ C\]to \[75{}^\circ C\] by the combustion of 1.0 gallon of gasoline in an automobile? (Given:\[C({{H}_{2}}O)=4.18J/{{g}^{{}^\circ }}C\])

    A) 34.45 kg                       

    B) 80.383 kg

    C) 22 kg                

    D) 224 kg

    Correct Answer: B

    Solution :

    [b] \[q=m\times c\times \Delta T,\text{ }m=q/\left( c\times \Delta T \right)\] \[=(24\times {{10}^{6}}\times 0.7)/(4.18\times 50)\] \[=80383\text{ }g\text{ }or\text{ }80.383\text{ }kg\]


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