Question Detail

CHM 101 CHM 101 Past Questions Objective Question
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Question

Nitric oxide reacts with chlorine to form nitrosyl chloride, NOCl. Use the following data to determine the rate equation for the reaction: 2NO + Cl₂ → 2NOCl. Data: Expt 1: [NO]=0.22, [Cl₂]=0.065, Rate=0.96; Expt 2: [NO]=0.66, [Cl₂]=0.065, Rate=8.6; Expt 3: [NO]=0.44, [Cl₂]=0.032, Rate=1.9.
Options
A rate = k[NO]
B rate = k[NO]²[Cl₂]
Correct Answer
C rate = k[NO]²
D rate = k[NO][Cl₂]
Correct Answer

Option B is the correct answer.

Detailed Explanation

Compare Expt 1 and 2: [Cl₂] constant, [NO] triples, rate increases by 9× (0.96 to 8.6 ≈ 9×) → second order in NO. Compare Expt 1 and 3: need to account for [NO] change; after adjusting, rate is first order in Cl₂. Thus rate = k[NO]²[Cl₂].

Hint

Find how rate changes when each reactant's concentration is changed while the other is held constant.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1195 of 1872
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