Some Basic Concepts of Chemistry - Result Question 98

####36. The weight of 1×1022 molecules of CuSO45H2O is (1991, 1M)

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Solution:

  1. Molar mass of CuSO45H2O

=63.5+32+4×16+5×18 =249.5g

Also, molar mass represents mass of Avogadro number of molecules in gram unit, therefore

6.023×1023 molecules of CuSO45H2O weigh 249.5g

1022 molecules will weigh 249.56.023×1023×1022=4.14g



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