The answer to this would be:
The shuttle can carry a maximum of 4 astronauts for one mission.
2 LiOH + CO2 -----> Li2CO3 + H2O
(3.50 × 10^4 g LiOH) (1 mol LiOH/ 24 g LiOH) ( 1 mol CO2 / 2 mol LiOH) ( 44 g CO2 /1 mol CO2) = 32, 083.33 g CO2
32, 083.33 g / 9 (8.8 × 10^2) = 4