Aluminum, silicon, and oxygen form minerals known as aluminosilicates. How many moles of aluminum are in 0.900 moles of pyrophyllite, Al2Si4O10(OH)?

There are 1.8 moles of aluminum.

Explanation:

To solve this problem we need to convert moles of pyrophillite (Al₂Si₄O₁₀(OH)) into moles of aluminum (Al):

With the above information in mind we can now do the conversion:

Thus the answer is that there are 1.8 moles of aluminum.

the answer is definitely c.