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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank The mole concept

  • question_answer
    Number of gm of oxygen in 32.2 g \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\]is [Haryana PMT 2000]

    A)                 20.8       

    B)                 22.4

    C)                 2.24       

    D)                 2.08

    Correct Answer: B

    Solution :

               \[N{{a}_{2}}S{{O}_{4}}\ .\ 10{{H}_{2}}O\] \[=2\times 23+32+4\times 16+10\times 18\]                                             \[=46+32+64+180=322gm\]                    322gm \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\] contains = 224 gm oxygen                    32.2gm \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\] contains                                 = \[\frac{32.2\times 224}{322}=22.4\,gm\]


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