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Calculate how many kg of lithium hydoxide must be stored on board for each day that the...

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animalover4546 | Student, Undergraduate | (Level 2) Honors

Posted December 16, 2012 at 6:32 PM via web

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Calculate how many kg of lithium hydoxide must be stored on board for each day that the five-member crew is in flight? Help Im so confused????????????

Five member crew usually consumes 4 kg of oxygen everyday. 

Cellular respiration formula: c6h12o6+6o2----> 6co2+6h2o

second equation: co2+2LiOH---> Li2Co3+H2o

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted December 17, 2012 at 2:59 AM (Answer #1)

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Once the oxygen is used by the crew `CO_2` is formed in the flight. `CO_2` is hazardous for health.So we need to remove that `CO_2` . So what is done here is forming Lithium carbonate using `CO_2` . It will remove `CO_2` from the air in flight and make a healthy environment.

 

`C_6H_12O_6+6O_2rarr 6CO_2+6H_2O`

 

Molar mass of Oxygen = 16g/mol

Amount of `O_2` consumed per day = 4kg

Amount of` O_2` moles consumed per day = `4000/32 ` = 125mol

 

Mole ratio

`O_2:CO_2 = 1:1`

 

Therefore;

Amount of `CO_2` formed per day = 125mol

 

`CO_2+2LiOH rarr Li_2CO_3+H_2O`

 

Mole ratio

`CO_2:LiOH = 1:2`

 

Therefore;

Amount of `LiOH` required per day = 125*2 = 250mol

 

Molar mass of `LiOH` = 24g/mol

 

mass of `LiOH` required `= 24*250 = 6000g = 6kg`

 

So for the process we need 6kg of LiOH.

 

Assumptions

  • All reactions are complete reactions
  • Only these two reactions are takes place in the system between the reactants

 

 

Sources:

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