A) HBR + Mg ->
This is confusing for me, how do I balance this out?
First, write the products.
HBr + Mg ==> MgBr2 + H2
Next, balance with coefficients.
2HBr + Mg ==> MgBr2 + H2
Finally, check it.
I see 2 H on both sides.
I see 2 Br on both sides.
I see 1 Mg on both sides.
There was a similar example like this in the book and it was ....
HBr + Al =
Write the produces.
HBr + Al ==> AlBr3 + H2
Balance with coefficients.
I note quickly that I need a 2HBr to balance H on the right but a 3HBr to balance Br on the right. When that happens, we know neither 3 nor 2 will work so we go with 6.
6HBr + 2Al ==> 2AlBr3 + 3H2.
Finally, check it.
I see 6 H on left and right.
I see 6 Br on left and right.
I see 2 Al on left and right.
6HBr + 2Al -> 2AlBr3 + 3H2.
My questions are that how did they get "6" Hbr? Also where did the 2Al come from, For the product part, I know that the three comes from Aluminum, but why do they not add it in the first part. This is really confusing me now, I think I'm forgetting this whole balancing stuff. DrBob222 please bring me back on track.
The 2 for 2AlBr3 is used because that's the only way to get 6 Br atoms and that forces us to place a 2 for Al on the left.
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