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

  • question_answer
    How many moles are present in \[5.3\,\,g\] of anhydrous sodium carbonate?

    A)  \[0.03\] moles   

    B)         \[0.04\] moles

    C)  \[0.05\] moles     

    D)         \[0.01\] moles

    Correct Answer: C

    Solution :

     Gram molecular weight of \[N{{a}_{2}}C{{O}_{3}}=2\times 23\times 12+3\times 16=106\,\,g\]             \[n=\frac{5.3}{106}=0.05\,\,\text{moles}\]


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