J & K CET Medical J & K - CET Medical Solved Paper-2009

  • question_answer
    How much volume of oxygen at STP, in litre is required to burn 4 g of methane gas completely?

    A)  11.2                                      

    B)  5.6

    C)  2.8                                        

    D)  8

    Correct Answer: A

    Solution :

                    \[\underset{\begin{smallmatrix}  1\,mol \\  16\,g \end{smallmatrix}}{\mathop{C{{H}_{4}}}}\,+\underset{\begin{smallmatrix}  2\,mol \\  2\times 22.4L \end{smallmatrix}}{\mathop{2{{O}_{2}}}}\,\xrightarrow{{}}C{{O}_{2}}+2{{H}_{2}}O\] At STP, \[\because \]For the combustion of\[16\text{ }g\text{ }C{{H}_{4}},\]oxygen required\[=2\times 22.4\text{ }L\] \[\therefore \] For the combustion of\[4\text{ }g\text{ }C{{H}_{4}},\]oxygen required will be                 \[=\frac{2\times 22.4\times 4}{16}L\] \[=11.2L\]


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