Question

9.0 mol Al reacts with 6.0 mol O2 to form Al2O3 according to the reaction below. how many moles of al2o3 form from 9.0 mol Al

Answer 1

Answer: 4.5 moles

Step-by-step explanation:

To understand how to solve this problem, you must understand the ratios written in this chemical equation.

The equation shows that 4 moles of Al forms 2 moles Al₂O₃. This creates the ratio 2:4 or
`(2)/(4)`

To solve, you can set the two ratios to each other and cross multiply.

`(2)/(4) = (x)/(9)`

18 = 4x

x = 4.5 mol Al₂O₃

*both
`(2)/(4)` and
`(4.5)/(9)` can be simplified as
`(1)/(2)`, which verifies your answer*