Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the
water of crystallisation is lost to the atmosphere as steam.
$When{\text{ }}3.10{\text{ }}g{\text{ }}of{\text{ }}hydrated{\text{ }}cobalt\left( {II} \right){\text{ }}sulfate,{\text{ }}CoS{O_4}{\text{ }} \bullet x{H_2}O,{\text{ }}is{\text{ }}heated{\text{ }}to{\text{ }}constant{\text{ }}mass{\text{ }}the{\text{ }}loss{\text{ }}in{\text{ }}mass{\text{ }}is{\text{ }}1.39{\text{ }}g.$
What is the value of x, to the nearest whole number?
1 )
4
2 )
6
7
4 )
11
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