Constructing Balanced Ionic Equations

[Priyadarshini]

Homework Statement

Write a balanced ionic equation for the half equations given below:
Al----> Al^+3 + 3e-
2H^+1 + 2e- -----> H2

Homework Equations

The Attempt at a Solution

I think the answer is:
2Al + 6H^+1 ----> 2Al^+3 + 3H2
But the answer in the book is:
4Al + 6H^+1 ----> 2Al^+3 + 3H2
What is the correct answer?

 

[Borek]

Answer in the book is not correctly balanced - so it is wrong.

 

[Priyadarshini]

Thanks!