Carbonic acid (h2co3) forms when carbon dioxide (co2) dissolves in water according to this equation: co2+h2o-> h2co3 how many moles of co2 must dissolve in an excess of water to produce 2 moles of h2co3? a. 3 mol b. 2 mol c. 1 mol d. 4 mol

In order to determine how many moles of CO2 provide 2 moles of H2CO3, we must look at the balanced reaction and compare the coefficients of each compound.

CO2 + H2O --> H2CO3

The equation above is already balanced; therefore, for every 1 mole of CO2, we get 1 mole of H2CO3.

2 moles H2CO3  x (1 mole CO2)/(1 mole H2CO3) = 2 moles CO2.

We simply convert the moles of H2CO3 to moles of CO2, which results in 2 moles of CO2 required to give 2 moles of H2CO3.

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