¿Cuál es el coeficiente del K2O cuando se balancea la ecuación: Al2O3 + KBr = AlBr3
KBr = AIBr; + K20?

The coefficient of K₂O : 3

Reaction

KBr + Al₂O₃ → K₂O + AlBr₃

give coefficient

aKBr + Al₂O₃ → bK₂O + cAlBr₃

K, left=a, right=2b⇒a=2b (eq 1)

Br,left=a, right=3c⇒a=3c (eq 2)

Al, left=2, right=c⇒c=2⇒a=3.2(eq 2)⇒a=6⇒6=2b(eq 1)⇒b=3

Equation

6KBr + Al₂O₃ → 3K₂O + 2AlBr₃

elements make up everything, and they combine to make compounds.

the answer is c