Question 1
A first-order reaction is 45% complete at the end of 31 minutes. What is the length of the half-life of this reaction?
◦ 36 min
◦ 27 min
◦ 1.9 h
◦ 45 min
◦ None of these are correct.
Question 2
A general reaction written as A + 2B → C + 2D is studied and yields the following data:
| [A]0 | [B]0 | Initial Δ[C]/Δt |
| 0.150 M | 0.150 M | 8.00 × 10–3 mol/L·s |
| 0.150 M | 0.300 M | 1.60 × 10–2 mol/L·s |
| | 0.300 M | 0.150 M | 3.20 × 10–2 mol/L·s |
What is the overall order of the reaction?
Reference: Ref 12-1
◦ 0
◦ 1
◦ 2
◦ 3
◦ 4