what mass of carbon dioxide is consumed by the reaction of 4.9g of water

Answer 1

CO₂ + H₂O ==> H₂CO₃

moles H₂O present = 4.9 g x 1 mole/18 g = 0.272 moles H₂O

mass of CO₂ consumed = 0.272 moles H₂O x 1 mol CO₂/mole H₂O x 44 g/mol CO₂ = 12. g CO₂ (2 sig.figs.)