Question

Calculate the percentage economic element in the following ore minerals: % metal moles metal x atomic weight of metal sum (moles of each element x atomic weight of each element] X 100 Molar masses (g/mol): Cu-63.55, Fe- 55.85, S-32.06, C- 12.01, 0- 16.00, H-1.008 a) Bornite- Cu5FeS4 b) Azurite- Cu3(CO3)2(OH)2

Answer 1

To calculate the percentage economic element in the ore minerals, we use the formula % metal moles metal x atomic weight of metal sum (moles of each element x atomic weight of each element) x 100.

Step-by-step explanation:

To calculate the percentage economic element in the ore minerals, we need to follow the given formula:

Percentage economic element = (% metal / moles metal) x atomic weight of metal sum (moles of each element x atomic weight of each element) x 100

Let's calculate it for the given ore minerals:

a) Bornite - Cu5FeS4

For bornite, the economic element is copper (Cu).

From the formula: Percentage economic element = (% copper / moles copper) x atomic weight of copper sum (moles of each element x atomic weight of each element) x 100

Now, we calculate the values and substitute them into the formula:

Percentage economic element = (5 / (5 + 1 + 4)) x (63.55 / (5 x 63.55 + 1 x 55.85 + 4 x 32.06)) x 100

Simplifying this expression gives us the percentage economic element in bornite.

b) Azurite - Cu3(CO3)2(OH)2

For azurite, the economic element is also copper (Cu).

Following the same formula, we calculate the values and substitute them into the formula:

Percentage economic element = (3 / (3 + 2 + 4 + 2)) x (63.55 / (3 x 63.55 + 2 x (12.01 x 3 + 16.00 x 3) + 4 x 16.00 + 2 x (1.008 + 16.00))) x 100

Simplifying this expression gives us the percentage economic element in azurite.

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