A 2 g sample of [tex]CoCl_{2} .xH_{2} O[/tex] is dried in the oven when the anhydrous salt is removed from the oven its mass is 1.565 g then the value of x is 0.024 .
Calculation ,
mass = 2 g ( given )
molar mass = 134.45 + x × 18
After dehydration or when the anhydrous salt is removed from the oven mass remain = 1.565 g
Molar mass = 134.45
Thus mass of [tex]H_{2} O[/tex] = 2 g - 1.565 g = 0.435 g
Number of moles of water = 0.435 g / 18 = 0.024 moles
Therefore value of x = 0.024
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