4. A 120.0 mg sample of a lead acetate hydrate, Pb(C2H3O2)2 × xH2O was heated to drive off the waters of hydration. The cooled residue had a mass of 103.0 mg. Calculate the value of x in the chemical formula. Show your work with Equation Editor.

The value of x in the chemical formula is 3.

Explanation:

Molecular mass of

Molecular mass of   = 325 g

Thus (325+18x) g of on heating gives = 325 g of

0.120 g of on heating should give = of which is given to be equal to 0.103 g

Thus

Solving for x

Thus the value of x in the chemical formula is 3.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).