How many half-lives are required for the concentration of reactant to decrease to 12. 5% of its original value?.
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The volume of H₂ evolved at NTP=0.336 L
<h3>Further explanation</h3>Reaction
Decomposition of NH₃
2NH₃ ⇒ N₂ + 3H₂
conservation mass : mass reactants=mass product
0.28 NH₃= 0.25 N₂ + 0.03 H₂
2 g H₂ = 22.4 L
so for 0.03 g :