The mineral enargite is 48.41% cu, 19.02% as, and 32.57% s by mass. what is the empirical formula of enargite?

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Chemistry

Schultz

8 July, 10:01

The mineral enargite is 48.41% cu, 19.02% as, and 32.57% s by mass. what is the empirical formula of enargite?

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Ayala · Answer 1

Answer is: the empirical formula of enargite is Cu ₃AsS₄.

If we use 100 grams of enargite:

n (Cu) = 48,41 g : 63.55 g/mol.

n (Cu) = 0.761 mol.

n (As) = 19.02 g : 74.92 g/mol.

n (As) = 0.254 mol.

n (S) = 32.57 g : 32.065 g/mol.

n (S) = 1.016 mol.

n (Cu) : n (As) : n (S) = 0.761 mol : 0.254 mol : 1.016 mol / 0.254.

n (Cu) : n (As) : n (S) = 3 mol : 1 mol : 4 mol.