# Chemistry

The space shuttle environmental control system handles excess CO2 (which the astronauts breathe out; it is 4.0% by mass of exhaled air) by reacting it with lithium hydroxide, LiOH, pellets to form lithium carbonate, Li2CO3 , and water. If there are four astronauts on board the shuttle, and each exhales 20. L of air per minute, how long could clean air be generated if there were 28,000 g of LiOH pellets available for each shuttle mission? Assume the density of air is 0.0010 g/mL.

1. This is an example of a "work horse" problem designed to make you think through many steps. Do what you can, show your work, and someone will help you finish if you explain what you don't understand about the next step.

posted by DrBob222

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