# ChE102 - Tutorial 10 Solutions - ChE102 Chemistry for...

• Homework Help
• 3

This preview shows page 1 - 2 out of 3 pages.

ChE102 Chemistry for Engineers - Tutorial 10 Solutions Solve the following problems either individually or in small groups (3 students maximum). Submit one copy of the solutions per group. Ask the TA for help if you need assistance solving the problems. Problem 1 The following data were obtained for the reaction, 2ClO 2 (aq) + 2OH (aq) → ClO 3 (aq) + ClO 2 (aq) + H 2 O(l) [ClO 2 ] 0 (mol·L 1 ) [OH ] 0 (mol·L 1 ) rate (mol·L 1 ·s 1 ) 0.0500 0.1000 5.75 × 10 2 0.1000 0.1000 2.30 × 10 1 0.1000 0.0500 1.15 × 10 1 What would be the initial rate (in mol·L 1 ·s 1 ) for an experiment with: [ClO 2 ] 0 = 0.1750 mol·L 1 and [OH ] 0 = 0.0844 mol·L 1 ? Solution 𝑟 = 𝑘[ClO 2 ] ? [OH ] ? 2 ) 5 . 0 ( 25 . 0 100 . 0 05 . 0 10 30 . 2 10 75 . 5 1 2 a a a 1 ) 2 ( 2 05 . 0 100 . 0 10 15 . 1 10 30 . 2 1 1 b b b Therefore: 𝑟 = 𝑘[ClO 2 ] 2 [OH ] Solve for k : 𝑘 = 2.3×10 −1 mol L s (0.1 mol L ) 2 (0.1 mol L ) = 230 L 2 mol 2 s Finally: 𝑟 = (230 L 2 mol 2 s ) (0.175 mol L ) 2 (0.0844 mol L ) = 0.594 mol L s