JEE Main & Advanced Chemistry States of Matter Question Bank Ideal gas equation and Related gas laws

  • question_answer There are \[6.02\times {{10}^{22}}\] molecules each of \[{{N}_{2}},\,{{O}_{2}}\] and \[{{H}_{2}}\] which are mixed together at 760 mm and 273 K. The mass of the mixture in grams is             [Pb. PMT 1997]

    A)                 6.2         

    B)                 4.12

    C)                 3.09       

    D)                 7

    Correct Answer: A

    Solution :

               \[6.02\times {{10}^{22}}\] molecules of each \[{{N}_{2}},{{O}_{2}}\] and \[{{H}_{2}}\]                    \[=\frac{6.02\times {{10}^{22}}}{6.02\times {{10}^{23}}}\] moles of each                    Weight of mixture = weight of 0.1 mole \[{{N}_{2}}+\] weight of 0.1 mole \[{{H}_{2}}\]+ weight of 0.1 mole of \[{{O}_{2}}\]                                 \[=(28\times 0.1)+(2\times 0.1)+(32\times 0.1)\] \[=6.2gm\]      


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