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PLEASE HELP

Carbonic acid (H₂CO3) forms when carbon dioxide
(CO₂) a dissolves in water according to this equation: CO2 + H₂O → H₂CO3
How many moles of
CO2 must dissolve in an excess of water to produce 3 moles of
H₂CO3?
1 mol
2 mol
3 mol
4 mol