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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Mock Test - Some Basic Concepts of Chemistry

  • question_answer
    For the reaction \[2x+3y+4z\to 5w\] Initially if 1 mole of x, 3 moles of y and 4 moles of z is taken. If 1.25 moles of w is obtained then % yield of this reaction is

    A) 50%     

    B) 60%

    C) 70%                 

    D) 40%

    Correct Answer: A

    Solution :

      \[2x+3y+4z\to 5w\]
    Given moles 1       3      4
    Stoichiometric coefficient 2       3      4
    Checking for L.R. \[\frac{givenmoles}{stoichiometric\,\,coeffiient}\overset{x}{\mathop{\frac{1}{2}}}\,\text{   }\,\,\overset{y}{\mathop{\,\frac{3}{3}=1}}\,\,\,\,\,\,\,\,\overset{z}{\mathop{\frac{4}{4}=1}}\,\] \[\frac{1}{2}<1\] \[\therefore x\,\,is\,\,L.R.\] According to stoichiometry, 2 moles of x yields 5 moles of w. 1 mole of x yield \[\frac{5}{2}\]=2.5 moles of w % yield = \[\frac{Actual\,yield}{yield\,obtained}\times 100\] =\[\frac{1.25}{2.5}\times 100=50%\]


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