Question

Aluminum, silicon, and oxygen form minerals known as aluminosilicates. How many moles of aluminum are in:

1. 1.65 moles of pyrophyllite, Al₂Si₄O₁₀(OH)₂

_2. 1.40 moles of mica, KAl₃Si₃O₁₀(OH)₂

_3. 3.00 moles of albite, NaAlSi₃O₈

Answer 1

1. 1 mole of pyeophyllite has 2 moles of Al.

So, in 1.65 moles, the moles of Al is

= 2 x 1.65

= 3.30 mol

2. 1 mol of mica has 3 moles of Al.

So, in 1.40 moles, the moles of Al is

= 3 x 1.40

= 4.20 mol

3. 1 mole of albite has 1 mol of Al.

So, in 3.00 moles, the moles of Al is

= 1 x 3.00

= 3.00 moles

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