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

Unlike mixtures and alloys, chemical compounds have very precisely determined compositions, meaning that the quantities of each of the elements present in them are fixed. These quantities can be measured as mole ratios, mass percent, etc.

The given two compounds, dolomite and fluorite, a7.81 g of dolomite contains 1.70 g of Ca.

the mass percent of calcium is as:

1.70g/7.81g × 100% = 21.8%

Now, let's look at fluorite, with the chemical formula

CaF2, molar mass = 78g/mol

In other words, 1 mole of this compound would weigh 78 g and would contain 40 g of calcium.

mass percent of the calcium in fluorite is computed as:

40g/78g × 100% = 51.3%

Comparing the two values, 51.3% of the calcium in fluorite and 21.8% in dolomite, we conclude that fluorite is the richer source of calcium.

Learn more about mass percent here:

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