Answer to Question #21143 in Organic Chemistry for Sadaam Ahmed
a)Calculate the mass of lithium remaining after the reaction is over.
b) Calculate the volume of hydrogen gas produced, if this reaction occurs at STP.
2Li + H2SO4 = Li2SO4 + H2
First seek theamount of substance for the lithium and sulfuric acid:
n(Li) = 125/7 = 17.857 mol
n(H2SO4) = 3 x 2.5 = 7.5 mol
Next seek the amount ofsubstance lithium remaining after the reaction is over:
n(Li) = 17.857 - 15 = 2.857 remaining after the reaction is over.
Тhe amount of substance ofhydrogen will be:
n(H2) = n(H2SO4) = 15 mol
V(H2) = n(H2) x Vm(H2)
V(H2) = 15 mol x 22.4 mol/l = 336 liters
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