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75% carbon , 25% hydrogen

Accepted Answer

The empirical formula of a compound is the simplest whole number ratio of the atoms in the compound. To find the empirical formula of a compound with 75% carbon and 25% hydrogen, we can follow these steps:

1. Convert the percentages to grams.
Assuming we have 100g of the compound:
Carbon: 75g
Hydrogen: 25g
2. Convert the grams to moles.
Carbon: 75g / 12.01 g/mol = 6.24 mol
Hydrogen: 25g / 1.01 g/mol = 24.75 mol
3. Divide each mole value by the smallest number of moles.
In this case, the smallest number of moles is 6.24 mol.
Carbon: 6.24 mol / 6.24 mol = 1
Hydrogen: 24.75 mol / 6.24 mol = 4

The empirical formula is therefore CH4.

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