Perchloric acid = HClO4
Sodium carbonate = Na2CO3
2HClO4 + Na2CO3 ==> H2CO3 + 2NaClO4 ==> H2O + CO2 + 2NaClO4
To answer this question, we need to know the concentration of the perchloric acid (HClO4). We are given4.55 L, but we are not provided the concentration. Hence, it is not possible to find moles of HClO4.
Perhaps, you should go back and re-read the question, and then submit it again.