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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    The enthalpy of combustion of methane at \[{{25}^{o}}C\] is \[890\,kJ\]. The heat liberated when \[3.2\,g\] of methane is burnt in air is              [KCET 2004]

    A)                 \[445\,kJ\]         

    B)                 \[278\,kJ\]

    C)                 \[-890\,kJ\]        

    D)                 \[178\,kJ\]

    Correct Answer: D

    Solution :

               1 mole (i.e.,) \[16gm\] of methane on combustion liberate \[890\,kJ\]                                 \[\therefore \] \[3.2\,gm\] will liberate \[=\frac{890\times 3.2}{16}\]\[=178\,KJ\]


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