need help with chemistry

Question

If 0.1031 moles of aluminum sulfide react with fluorine, to make aluminum fluoride and elemental sulfur (S), how many moles of fluorine are used up?

Answer 1

Hello, Molly,

We need to have a balanced equation to start. This was a little more difficult than some, but here's where I wound up:

2Al₂S₃ + 3F₂ = 2AlF₃ + 6S

Check my work before going any further.

If this is correct and balanced, we want to find the number of moles of F₂ that are consumed (F is a diatomic molecule), The balanced equations tells us that the molar ration of F₂ to Al₂S₃ is 3/2. That is, 3 moles of F₂ are required for every 2 moles of Al₂S₃.

Since we use 0.1031 moles of Al₂S₃, we'll consume 2*(0.1031) moles of F₂. Assuming there is enough, we'd consume 0.2062 moles of F₂.

I hope this helps,

Bob