To find the empirical formula, we need to determine the ratio of the number of atoms of each element in the compound.
1. Convert the mass of each element to moles:
- Copper (Cu): 6.4g / 63.55 g/mol = 0.1 mol
- Sulphur (S): 3.2g / 32.06 g/mol = 0.1 mol
- Oxygen (O): 6.4g / 16.00 g/mol = 0.4 mol
2. Find the ratio of the elements by dividing each mole value by the smallest mole value:
- Cu: 0.1 mol / 0.1 mol = 1
- S: 0.1 mol / 0.1 mol = 1
- O: 0.4 mol / 0.1 mol = 4
The empirical formula of the compound is therefore CuSO4
A sample of anhydrous copper2 sulphate on analysis was found to contain 6.4grams of copper,3.2grams sulphur and 6.4grams oxygen determine it's empirical formula
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