2NaHCO3 ---> Na2CO3 + H20 +CO2
| +2HCl | +2HCl
2NaCl + 2CO2 + 2H20
Yes, the equation with hash is wrong! You multiply by 2 with the (-34), then you should have also multiply
(NaCl + CO2 + H20) by 2 to 2NaCl + 2CO2 + 2H2O, otherwise it is not balanced.
When u do an energy cycle,
1) Ensure that the reagents you 'add' to the cycle such as in this case, HCl, is balanced. What is mean by balance is the amount of HCl 'added' in the clockwise direction is the same as the anticlockwise.
2) Ensure the final products of the clockwise and anticlockwise direction are the same, in this case, its the one highlighted in blue.
I think you are asking about this?