Mole concept another one

Air sample from industry heavily polluted with CO₂ was analyzed.In one analysis,56L of air measured at NTP was passed through a 250mL of 0.025M NaOH solution where CO₂ was absorbed completely.25mL of the above solution was then treated with excess BaCl₂ solution where all carbonate was precipitated as BaCO₃.Solution was filtered off and filtrate required 25mL of 0.0005M HCl solution for neutralization.

Q1ppm strength of CO₂(volume by volume)=_____
Q2Weight of ppt. BaCO₃ obtained from 20ml of test solution=____
Q3Fraction of original NaOH(by mole) reacted with CO₂=____