So, you ask where does the 3 in bromide come from. Are you asking about the 3 in front of Br2(g) or the the 3 in AlBr3? The 3 in front of bromine (3Br2) is based on the balancing of the equation since you must have the same number of Br atoms on each side. The 3 in AlBr3 is there because Al has a valence of 3+ and Br has a valence of 1-, so it takes 3 Br to balance the 1 Al.
You are watching: Aluminum bromide chlorine yield aluminum chloride bromine
You ask why does chlorine gas get a 2? Chlorine is a diatomic gas, just like H2, O2, N2, Br2, etc. You just have to memorize which gases are diatomic.
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