Concentration Changes Over Time

AP Chemistry· difficulty 4/5

For another reaction B → product, only the 1/[B] vs t plot is linear with slope 0.50 M⁻¹·s⁻¹ and y-intercept 5.0 M⁻¹.

t (s) 1/[B] slope = +0.50

What is the initial concentration of B?

  • A

    0.20 M

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  • B

    5.0 M

  • C

    2.0 M

  • D

    0.50 M

Explanation

For second-order: 1/[B] = kt + 1/[B]₀. y-intercept = 1/[B]₀ = 5.0 M⁻¹ ⇒ [B]₀ = 0.20 M.

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