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Haryana PMT Haryana PMT Solved Paper-2003

  • question_answer
    The number of oxygen molecules in a cylinder of volume 1m3 at a temperature of \[27{}^\circ C\] and pressure 13.8 Pa is (Boltzmaans constant \[k=1.38\times {{10}^{-23}}J\text{ }{{K}^{-1}}\]) is :

    A)  \[6.23\times {{10}^{26}}\]          

    B)  \[0.33\times {{10}^{28}}\]

    C)  \[3.3\times {{10}^{21}}\]            

    D)  none of these

    Correct Answer: C

    Solution :

                    Number of molecules of oxygen in the    cylinder is                          \[n=\frac{PV}{RT}\] \[=\frac{13.8\times 1}{1.38\times {{10}^{-23}}\times 300}\] \[=3.3\times {{10}^{21}}\]      


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