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NEET AIPMT SOLVED PAPER 2003

  • question_answer
                    For the reaction, \[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\xrightarrow[{}]{{}}3C{{O}_{2}}(g)+4{{H}_{2}}O\,(l)\] at constant temperature, \[\Delta H-\Delta E\] is

    A)                                                                                                                                                                                            +3RT      

    B)                 -RT                         

    C)                 +RT                        

    D)                 -3RT

    Correct Answer: D

    Solution :

                    For the reaction,                  \[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\xrightarrow[{}]{{}}3C{{O}_{2}}(g)+4{{H}_{2}}O(\ell )\]                 \[\Delta n\]= number of gaseous moles of products                 - number of gaseous moles of reactants                 \[=3-6=-3\] \[\therefore \]      \[\Delta H-\Delta E=\Delta nRT\] \[or\Delta H-\Delta E=\Delta nRT\] \[\therefore \Delta H-\Delta E=-3RT\]


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