Question

Lithium oxide (Li₂O; molar mass = 30 g mol^–1 ) is used in space shuttles to remove water vapour according to the following reaction

Li₂O(s) + H₂O(g) →2LiOH_(s)

If 60 kg of water and 45 kg of Li₂O are present in a shuttle 

I. water will be removed completely 

II. Li₂O will be the limiting reagent 

III. 75 kg of Li₂O will be required to completely remove the water present 

IV. 27 kg of water will remain in the shuttle at the end of the reaction

(a) II only (b) II and IV (c) III and IV (d) II, III

Answer 1

Correct option (d) II, III

Explanation:

18gm require = 30 gm Li₂O

45gm will require = 30/18 x 45 = 75kg