The half-life for the reaction, N2O5⇒2NO2+12O2 is 12 minutes at 30∘C. Starting with 100 g of N2O5 how many gram of N2O5 will remain after a period of 1 hour 36 minutes.
Options:
A .  
1.25 g
B .  
0.39 g
C .  
1.77 g
D .  
0.5 g
Answer: Option B : B One hour 36 minutes, i.e., 96 minutes is 8 half lives Hence the amount left over is 10028=100256=0.39g
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