Given the balanced equation representing a reaction:4Al(s) + 3O2(g) → 2Al2O3(s) + energy. What is the number of moles of Al2O3 formed when 3.00 moles of Al reacts completely with oxygen?

Regents Chemistry June 2026

35 Given the balanced equation representing a reaction:

4Al(s) + 3O2(g) → 2Al2O3(s) + energy

What is the number of moles of Al2O3 formed when 3.00 moles of Al reacts completely with oxygen?

(1) 1.50 mol

(2) 2.25 mol

(3) 6.00 mol

(4) 4.00 mol

Solution:

The coefficients in the equation represent moles. This equation tells us for 4 moles of Al, 2 moles of Al2O3 will be produced. Therefore, the number of moles of Al2O3 will by half of the moles of Al. If 3 moles of Al reacts, then 1.5 mol of Al2O3

Choice 1 is the correct answer.

LINKS:

Regents Chemistry Guides and Solutions

Chemistry Tutoring

More Regents Chemistry Practice