Q28P - Chemistry: Molecular Nature Of Matter And Change

Question

Dolomite is a carbonate of magnesium and calcium. Analysisshows that 7.81 g of dolomite contains 1.70 g of Ca. Calculate themass percent of Ca in dolomite. On the basis of the mass percentof Ca, and neglecting all other factors, which is the richer sourceof Ca, dolomite or fluorite (see Problem 2.20)?

Step-by-Step Solution

Answer

The mass percent of Ca = 21.8%;

Therefore we can say that fluorite is a better source of calcium than that dolomite.

The mass percentage of calcium in fluorite had been found 51%, Therefore fluorite is better source of calcium than dolomite.

The final result found was:

Mass percentage(Ca) = 21.8%

Step1. Calculation of the mass percent of the calcium in dolomite

For the calculation of the mass percent of the calcium in dolomite, we have following equation:

Mass percentage = $\frac{\mathrm{m}(\mathrm{Ca} )}{\mathrm{m}(\mathrm{dolomite} )} \times 100 =\frac{1.70 \mathrm{g}}{7.81 \mathrm{g}}\times 100 = 21.8\%$

Hence mass percentage of Ca = 21.8%

Step2. Calculation of mass percentage of calcium in fluorite.

The mass percentage of calcium in fluorite had been found 51%, Therefore fluorite is a better source of calcium than dolomite.

The final result found was:

Mass percentage(Ca) = 21.8%