Can someone please balance this equation Al + H2O -> AlOH + H2?

Al + H2O -> AlOH + H2

Balance the compounds with multiple elements first because these coefficients affect the most other compounds. In this case, AlOH has the most elements. The products (right) side of the equation has 3Hs whereas the reactants (left) side only has 2. Let's start there.

Al + 2H2O -> 2AlOH + H2

Alright, so by changing the coefficients on the AlOH and H2O, we get 4 Hs on each side. Hydrogen is balanced. Score!

Now, you notice that there are 2 Als on the right side and 1 on the left. No problem, just balance it again.

2Al + 2H2O -> 2AlOH + H2

Perfect. Every element is perfectly balanced, so this is your answer.

In general, start by balancing the more complex compounds and work your way to the diatomic/monatomic ones.

The reaction is wrong .

The reaction is not feasible as it cannot be balanced.The feasibility of a reaction is largely determined by whether it's formula equation can be balanced or not.

It should be rather;

Al + H2O (under high heat) ----> Al2O3 + H2

Now this is the proper reaction as it can be balanced as follows.

2.Al + 3.H2O ---> Al2O3 + 3.H2

Hope this helped. :)