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9th Class Science Structure of the Atom Question Bank Nature of Matter

  • question_answer
    Number of moles of water in 1.8 litre of pure water is (Density of water = 1 g/ml)

    A)  18                         

    B)         100  

    C)  36                                         

    D)  55.4

    Correct Answer: B

    Solution :

     Density of water\[=1\,\,g/ml\] Since, \[1\,\,ml\] of water weights\[=1\,\,gm\] \[\therefore \]\[1800\,\,ml\] water weighs \[=1800\,\,gm\] Now, \[18\,\,gm\] of water contains \[=1\,\,mole\] \[\therefore 1800\,\,gm\] of water contains\[=\frac{1\times 1800}{18}\] \[=100\,\,moles\]


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