Question

20.3g sample of MgCl2.xH2O on heating forms 10.8 grams water and anhydrous MgCl2. the value of x is (molecular mass of MgCl2 equal to 95)​

Answer 1

Answer: The value of 'x' in the above compound is found to be 6.

Explanation:

The given chemical formula is $MgCl_2.xH_2O$.

To calculate the molecular mass, we add up the masses of each of the element multiplied by the number of atoms present in that compound.

The molecular mass of $MgCl_2.xH_2O=95+18x$

By Stoichiometry:

If $(95+18x)$ grams of compound contains $18x$ grams of water.

So, 20.3 grams of compound will contain = $\frac{18x}{(95+18x)}\times 20.3$ grams of water.

The amount of water formed after heating hydrated magnesium chloride is 10.8 grams.

Solving the equation, we get:

$\frac{18x}{(95+18x)}\times 20.3=10.8\\\\x=6$

Hence, the value of 'x' in the above compound is found to be 6.

Answer 2

Answer:

The value of x is 6.

Hence, the formula becomes MgCl2.6H2O which is magnesium chloride hexahydrate.

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