A Gas-Phase Decomposition Is First-Order with Respect to the Reactant

question 70

Multiple Choice

A gas-phase decomposition is first-order with respect to the reactant, R. If the initial concentration of R is 1.0 × 10^-4 mol L^-1 and the rate constant k = 1.08 × 10^-6 s^-1, what concentration of R remains after 25 days?

• A) 1.0 × 10^-3 mol L^-1
• B) 1.0 × 10^-4 mol L^-1
• C) 9.6 × 10^-5 mol L^-1
• D) 4.3 × 10^-5 mol L^-1
• E) 9.7 × 10^-6 mol L^-1

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