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Order of Reaction

The rate cons...

Question

The rate constant of a first-order reaction is $3 \times 10^{- 6} s e c^{- 1}$ . If the initial concentration is $0.10 M$ , the initial rate $(i n M s^{- 1})$ is

A

3 \times 10^{- 6}

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B

3 \times 10^{- 5}

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C

3 \times 10^{- 8}

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D

3 \times 10^{- 7}

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Solution

The correct option is B $3 \times 10^{- 7}$
Given,
Rate constant, k = $3 \times 10^{- 6} s e c^{- 1}$
Initial concentration, [A] = $0.01 M$

As we know,

$R a t e = K \times [A]$

$= 3 \times 10^{- 6} \times 0.1 = 3 \times 10^{- 7} M s e c^{- 1}$

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Similar questions

Q. The rate constant of a first order reaction is

3 \times 10^{- 6} s e c^{- 1}

. If initial concentration is 0.10 M, find out the initial rate

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Sr.No.	$[A]_{0} / M$ (lonic conc.)	$[B]_{0} / M$ (lonic conc.)	rate/ $(M s e c^{- 1})$
1	$1.6 \times 10^{- 3}$	$5 \times 10^{- 2}$	$10^{- 3}$
2	$3.2 \times 10^{- 3}$	$5 \times 10^{- 2}$	$4 \times 10^{- 3}$
3	$1.6 \times 10^{- 3}$	$10^{- 1}$	$2 \times 10^{- 3}$
4	$3.2 \times 10^{- 3}$	$10^{- 1}$	$8 \times 10^{- 3}$

For the reaction

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; starting with different initial concentration of A and B, initial rate of reaction were determined graphically in four experiments :
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S.No.	[A] M (Initial conc.)	[B] M (Initial conc.)	rate (M $s e c^{- 1}$ )
1	$1.6 \times 10^{- 3}$	$5 \times 10^{- 2}$	$10^{- 3}$
2	$3.2 \times 10^{- 3}$	$5 \times 10^{- 2}$	$4 \times 10^{- 3}$
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Q. The rate of a first order reaction is

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