Reverse calculations percentage composition from formula

REVERSE CALCULATIONS PERCENTAGE COMPOSITION FROM FORMULA [Pg.160]

We can turn this sort of calculation around and convert chemical formula into percentage composition. [Pg.160]

Let us take calcium carbonate, CaCOa, RFM 100. Calcium has a RAM of 40, so the mass of calcium contributes /looths to the mass of 1 mole of calcium carbonate. [Pg.160]

Carbon contributes 12/100 and oxygen (3 x 16)/100 their percentages are 12% and 48%, respectively. [Pg.160]

Practise these calculations with Questions 5 and 6 at the end of this unit. If you are not sure whether you have done them correctly, convert the formula you have obtained back into percentage composition and see if you get back to the same percentages [Pg.160]

REVERSE CALCULATIONS PERCENTAGE COMPOSITION FROM FORMULA... [Pg.160]

In the previous section, you learned how to calculate the percentage composition of a compound from its chemical formula. Now you will do the reverse. You will use the percentage composition of a compound, along with the concept of the mole, to calculate the empirical formula of the compound. Since the percentage composition can often be determined by experiment, chemists use this calculation when they want to identify a compound. [Pg.208]

The procedure used in Example 0.15 can be reversed, if necessary, to calculate the empirical formula of a compound from the percent composition by mass of the compound (Figure 0.16). Because we are dealing with percentages and the sum of all the percentages is 100 percent, it is convenient to assume that we started with 100 g of a compound, as shown in Example 0.16. [Pg.43]

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