Aluminum Oxygen
Need Help Balancing Chemical Equation Please 
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1. Aluminum + Oxygen (arrow) Aluminum oxide
can you please help me write the formula and how to balance so i can do the rest of my hw please asap! thanks
Thank you!
your question is : Al + O2 -> Al2O3
so first of all, aluminum has a charge of 3+ and Oxygen has a charge of 2-
the rule for writing the compound is switchinig the charges so the 3+ becomes Oxygen’s subscript and vice versa.
so now on the right side we have 2 Al and 3 O while on the left side we only have 1 Al and 2 O.
balance the O’s first: what’s the smallest common multiple of 2 and 3? the answer is 6,
so to make O2 ‘= 6′, we need to multiply it by 3. since we CANNOT shove in a 2 between Al and O on the right side, we put the coefficient in front of the compound, making it 2Al2O3.
now oxygen is balanced. Al is not.
We have 4 Al on the right side, and only 1 on the left. Common multiple is 4 so on the left side we multiply Al by 4.
therefore you would have to have 4Al + 3O2 -> 2Al2O3. (the balanced eq)
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