- Lithium oxide is used to remove water from air according to the reaction Li20(s) + H2O (g) → 2 LiOH (s). If 72 kg of water is to be removed and 35 kg of Li2O is available, then (i) which reactant is limiting? (ii) how many kg of excess reactant is left?
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Answer:
We have,
mass of water = 72 kg = 72000g
moles of water =
18
72000
=4000moles
mass of Li
2
O = 35 kg = 35000g
moles of Li
2
O =
30
35000
=1166.67moles
since, from the above equation, we have
moles of Li
2
O = moles of H
2
O
since, moles of Li
2
O is less as compared to moles of water.
Hence, Li
2
O is limiting reagent
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