AN20240131-811_final1

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Toronto Metropolitan University *

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1233

Subject

Chemistry

Date

Feb 20, 2024

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docx

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3

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No 1: The reaction X + Y products was studied using the method of initial rates. The initial rate of consumption of X was measured in three different experiments. Data are provided below. Expt [X] 0 (in mol L -1 ) [Y] 0 (in mol L -1 ) Initial Rate (in mol L -1 s -1 ) 1 0.300 0.700 0.7959 2 0.450 0.700 1.194 3 0.300 2.10 2.388 What is the order of the reaction with respect to X? ______1_________ (Enter an integer.) What is the order of the reaction with respect to Y? _______1________ (Enter an integer.) Specify the units of k by giving the appropriate powers of mol, L and s: The power of mol is ____-2______ (Enter an integer.) The power of L is _____2_____ (Enter an integer.) The power of s is ______1____ (Enter an integer.) What is the value of k when the concentration and time are expressed in mol L -1 and s, respectively? _3.790 M -1 s -1 _______ (Enter a number with no units, accurate to 3 significant figures.)
No 2: Consider the data below for the reaction X products. Time (in seconds) [X] (in mol L -1 ) 0 2.7500 95.5 1.8396 101 1.2306 287 0.8215 382 0.5507 Note: You will have to determine the order of the reaction before you can answer parts (b) – (d) of this question. For parts (a), (c), and (d). Enter your answer accurate to three significant figures. Do not include units in your answer, but use concentrations in mol L -1 and time in seconds. (a) What is the average rate of consumption of X between 99.5 s and 287 s? _-0.0054 mol L -1 s -1 ___________ (b) What is the order of the reaction? (Enter an integer, or a fraction, e.g. 1/2, 3/2, etc.) _____2___________ (c) What is the value of the rate constant, k? _____0.00362 mol L -1 s -1 ______ What is the instantaneous rate of consumption of X at 287 s? __0.00244 mol L -1 s -1 Hint for part (d):
After you have established the order of the reaction, you can write the law for the reaction in two different forms. Which form can be used to calculate the rate? When using that form, what information do you need to calculate the rate at a specific time t? No 3: The decomposition reaction X products was studied as a function of time. Data are given in the table below. Time / s [X] / mol L -1 0 (exactly) 1.550 5.55 1.240 11.1 0.9295 16.7 0.6165 22.2 0.3090 What is the value of the rate constant? Give your answer accurate to three significant figures. Do not give units as part of your answer, but use concentration in mol L -1 and time in seconds. K = 0.0706.
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