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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    Calculate the number of moles present in \[4.9\,\,g\] of\[4.9\,\,g\]of\[{{H}_{2}}S{{O}_{4}}\].

    A)  \[0.01\] moles   

    B)         \[0.02\] moles

    C)  \[0.05\] moles     

    D)         \[0.03\] moles

    Correct Answer: C

    Solution :

     Gram molecular weight of\[{{H}_{2}}S{{O}_{4}}=1\times 2\]\[+32+16\times 4=98\,\,g\] Number of moles of\[{{H}_{2}}S{{O}_{4}}\]\[=\frac{4.9}{98}=0.05\]moles


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