Question

Student plans to react 2.1 mol of aluminum using this reaction

2AL (5) + 6H20(g) > 2AL(OH) 3 () + 3H2 (g)
The student multiples the 2.1 mol by the ratio 6:2. What did the student calculate?

Answer 1

The student is calculating how many moles of water are required to fully react with 2.1 moles of aluminum.

Step-by-step explanation:

2AL + 6H20 > 2AL(OH)3 + 3H2

The ratio 6:2 is the same as the molar ratio of H2O to Al: (6 moles H2O)/(2 moles Al). The student is likely calculating how many moles of water is required to fully react with 2.1 moles of Al.