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18 Nov 2019
The rearrangement of methyl isonitrile (CH_3NC) to acetonitrile (CH_3CN) is a first-order reaction and has a rate constant of 5.11 times 10^-5 s^-1 at 472 K. CH_3 - N = C rightarrow CH_3 - C = N Methyl isonitrile Acetonitrile If the initial concentration of CH_3NC is 0.0340 M: (a) What is the molarity of CH_3NC after 2.00 h? (b) How many minutes does it take for the CH_3NC concentration to drop to 0.0300 M? (c) How many minutes does it take for 20% of the CH_3NC to react? Rate constants for the reaction NO_2(g) + CO(g) rightarrow NO(g) + CO_2(g) are 1.3M^-1 s^-1 at 700 K and 23.0 M^-1 s^-1 at 800 K. (a) What is the value of the activation energy in kJ/mol? (b) What is the rate constant at 750 K? Sucrose (table sugar) reacts with water in acidic solution to give glucose and fructose, two simpler sugars that have the same molecular formulas but different structures. C_12H_22O_11(aq) + H_2O(l) rightarrow C_6H_12O_6(aq) + C_6H_12O_6(aq) Sucrose Glucose Fructose The reaction is first order in sucrose. At 25 degree C, it takes 3.33 h for the concentration of sucrose to drop from 1.20 M to 0.600 M. How many hours are required for the concentration to drop from 0.800 M to 0.0500 M?
The rearrangement of methyl isonitrile (CH_3NC) to acetonitrile (CH_3CN) is a first-order reaction and has a rate constant of 5.11 times 10^-5 s^-1 at 472 K. CH_3 - N = C rightarrow CH_3 - C = N Methyl isonitrile Acetonitrile If the initial concentration of CH_3NC is 0.0340 M: (a) What is the molarity of CH_3NC after 2.00 h? (b) How many minutes does it take for the CH_3NC concentration to drop to 0.0300 M? (c) How many minutes does it take for 20% of the CH_3NC to react? Rate constants for the reaction NO_2(g) + CO(g) rightarrow NO(g) + CO_2(g) are 1.3M^-1 s^-1 at 700 K and 23.0 M^-1 s^-1 at 800 K. (a) What is the value of the activation energy in kJ/mol? (b) What is the rate constant at 750 K? Sucrose (table sugar) reacts with water in acidic solution to give glucose and fructose, two simpler sugars that have the same molecular formulas but different structures. C_12H_22O_11(aq) + H_2O(l) rightarrow C_6H_12O_6(aq) + C_6H_12O_6(aq) Sucrose Glucose Fructose The reaction is first order in sucrose. At 25 degree C, it takes 3.33 h for the concentration of sucrose to drop from 1.20 M to 0.600 M. How many hours are required for the concentration to drop from 0.800 M to 0.0500 M?
Nestor RutherfordLv2
18 Apr 2019