Question

C6H12 + 9O2 ---> 6 CO2 + 6H2O
C6H12 + 12O2 ----> 6CO2 + 12H2O
which is correct?

Answer 1

also this one

Al2(CO3)3 -->>> Al2O3 + 3CO2

2Al2(CO3)3----->>2Al2O3 + 6CO2
Which is right? what is the difference?

Answer 2

#1 on 1
#1 on 2. Actually, both of the two last ones are balanced but the second one is just twice the first one. The correct one ALWAYS will be the smallersmallest set of coefficients.

Answer 3

thanks for the help!