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Question

Concentrations of A, B and C vs time are graphed for the reaction A3B+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=1 M
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C
C1=3 M
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D
t12=20 min
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Solution

The correct options are
A t2=5t1
B [A] at t2=1 M
C C1=3 M
D t12=20 min
A 3B+C
t=0 a0
t=t a0x 3x x
When [A]=(C)x=a02
So, t12=20 min
When [B]=[A]a0x=3xx=a04
So, t1=20log2log43=200.3[0.60.48]
=8 min
C1=3a04=3 M
When [C]=3 M[A]=a04So t2=2t12=40 min;So t2=5t1
And [A] at t2=1 M

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