A Reaction in Solution, a + B→P, Is Studied and Found

question 100

Multiple Choice

A reaction in solution, A + B→P, is studied and found to have the rate law Rate = k [A] with a rate constant of 3.5×10 ^{- 3} s ^{- 1}. If an experiment begins with a concentration of A equal to 0.20 M , at what time after the start of the experiment will the concentration of A be 0.050 M ?

• A) 2.9×10² s
• B) 5.9×10² s
• C) 3.9×10² s
• D) 1.7×10² s
• E) impossible rate law

---

Definitions:

Variable Costing

A cost accounting method that includes only variable costs—costs that change with production levels—in product cost calculations.

Manufacturing Margin

The difference between the cost of manufacturing goods and the sale price, indicating the profitability of production activities.

Unsold Units

Inventory items that have not been sold by the end of a selling period, affecting inventory carrying costs and cash flow.

Variable Costing

A costing method that includes only variable production costs—direct materials, direct labor, and variable manufacturing overhead—in product costs.