Which chemical equation is balanced?


a. 2LiOH + CO2 → Li2CO3 + H2O


b. LiOH + CO2 → Li2CO3 + H2O


c. LiOH + 3CO2 → 2Li2CO3 + H2O


d. 4LiOH + CO2 → Li2CO3 + 2H20