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Question

Find the number of moles of MgSO4.7H2O in a pure sample that contains 0.0022 moles of oxygen atoms.
 
  1. 0.2 moles
  2. 0.002 moles
  3. 0.2 millimoles
  4. 2 moles 


Solution

The correct option is C 0.2 millimoles
11 O-atoms are present in one formula unit of MgSO4.7H2O.

So, 11 moles of O-atoms are present in 1 mole of MgSO4.7H2O.

The number of moles of MgSO4.7H2O that would have 0.0022 moles of O-atoms are 
=0.002211
= 0.0002
= 0.2 millimoles

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