Question

1. Part: A The rate constant for a certain reaction is k = 6.00×10⁻³ s−1. If the initial reactant concentration was 0.550 M, what will the concentration be after 10.0 minutes?

Part B: A zero-order reaction has a constant rate of 1.80×10⁻⁴M/s. If after 75.0 seconds the concentration has dropped to 7.50×10⁻²M, what was the initial concentration?

2. At 500 ∘C, cyclopropane (C3H6) rearranges to propane (CH3−CH=CH2). The reaction is first order, and the rate constant is 6.7×10−4s−1. If the initial concentration of C3H6 is 5.50×10⁻² M.

Part A: How many minutes does it take for the C3H6 concentration to drop to 1.40×10⁻² M?

Part B: How many minutes does it take for 20% of the C3H6 to react?

3. Butadiene (C4H6) reacts with itself to form a dimer with the formula C8H12. The reaction is second order in C4H6. If the rate constant at a particular temperature is 4.0×10−2M−1s−1 and the initial concentration of C4H6 is 2.50×10⁻² M.

What is its molarity after a reaction time of 1.30 h?