2LiOH + CO2 yields Li2CO3 + H2O will the astronauts survive and how much water is made if there is 2.00 kg LiOh and expel 35kg of CO2?

Answer 1

Here is a worked example of a stoichiometry problem.
Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html