Determine the number of atoms of each element in the empirical formula of a compound with the following composition:

68.75 percent c, 10.90 percent h, 20.35 percent o.

The empirical formula is

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C= 68.75 g

Mass of H = 10.90 g

Mass of O = 20.35 g

Step 1 : convert given masses into moles.

Moles of C =

Moles of H =

Moles of O =

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =

For H =

For O =

The ratio of C : H: O= 4.5: 8.6: 1

converting them into whole number ratio by multiplying by 2

Hence the empirical formula is

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