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21 July, 09:37

The carbon dioxide exhaled by astronauts can be removed from a spacecraft by reacting it with lithium hydroxide (LiOH). The reaction is as follows: CO2 (g) + 2LiOH (s) Li2CO3 (s) + H2O (l). An average person exhales about 20 moles of CO2 per day. How many moles of LiOH would be required to maintain two astronauts in a spacecraft for three days?

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  1. 21 July, 09:50
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    Two astronauts would exhale about 40 moles of carbon dioxide daily.

    Carbon dioxide reacts with lithium hydroxide in a 1 : 2 mole ratio. Set up a proportion:

    1 : 2 = 40 : x

    Then, find x: 12=40x

    Cross multiply. x = 80 moles of LiOH per day for both astronauts
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