Concentrations of A, B and C vs time are graphed for the reaction A⟶3B+C. The rate of the reaction is defined as r = k [A] (log2=0.3,log3=0.48) Find the correct options:
A
t2=5t1
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B
[A] at t2=1M
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C
C1=3M
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D
t12=20min
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Solution
The correct options are At2=5t1 B[A] at t2=1M CC1=3M Dt12=20min A⟶3B+C t=0a0 t=ta0−x3xx When [A]=(C)⇒x=a02 So, t12=20min When [B]=[A]⇒a0−x=3x⇒x=a04 So, t1=20log2log43=200.3[0.6−0.48] =8min C1=3a04=3M When [C]=3M⇒[A]=a04Sot2=2t12=40min;Sot2=5t1 And [A]att2=1M