Recent questions tagged rate-of-reaction

For the reaction $A+B \rightarrow C+D$, calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The activation energy for a certain reaction is 76.7 kJ mol$^{-1}$. How many times faster will the reaction occur at 50$^\circ$C compared to 0$^\circ$C?

asked Jul 25, 2014 by balaji.thirumalai

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Calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant of a reaction at 32$^\circ$C is 0.055 s$^{-1}$. If the frequency or pre-exponential factor is 1.2 $\times$ 10$^{13}$ s$^{-1}$, what is the activation energy?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

If a temperature increase from 20$^\circ$C to 35$^\circ$C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant (k) for a reaction was determined as a function of temperature. A plot of $ln\; k$ versus $ \large\frac{1}{T}$ (in $K$) is linear and has a slope of $-1.01 \times 10^{4}\;K$. Calculate the activation energy for the reaction.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

A certain reaction is first order, and 540 s after initiation of the reaction, 32.5% of the reactant remains. At what time after initiation of the reaction of the reaction will 10% of the reactant remain?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

A certain first order reaction is 45% complete in 65 seconds. Determine the rate constant and the half-life for this process.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate half-life for first-order reaction if 68% of a substance is reacted within 66 s.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

What is the rate of a reaction if $[A]_o = 560\;M$, $[B]_o = 0.2\;M$, and 2nd order rate constant is $0.1\;M^{-1}s^{-1}$?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

What is the concentration of $A$ at time $45\;s$ if $[A]_o = 1\;M$, $[B]_o = 45\;M$, and 2nd order rate constant is $0.6\;M^{-1}s^{-1}$?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

If $[A] = 55\;M$ at $39s$, $[A]_o = 99\;M$, and $[B]_o = 1000\;M$, what is the 2nd order reaction rate constant?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant for the 2nd order reaction shown below is $0.54 M^{–1}$ at 300$^{\circ}$ C. How many seconds would it take for the concentration of NO$_s$ to decrease from $0.62\; M$ to $0.28\; M$?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of phosphine to phosphorus and hydrogen gas is a first order reaction, with a half-life of 35 s at 680$^\circ$C. Calculate the time required for 95% of phosphine to decompose.

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of N$_2$O$_5$ to form NO$_2$ and O$_2$ is a first order reaction. The rate constant for the reaction is $5.1x10^{–4}s^{-1}$ at $318^{\circ} K$. Calculate the half-life of this reaction.

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The following data was collected in three different experiments:

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Consider the following reaction:$ A + 3 B \rightarrow 2 C + 2 D$. In one experiment, the rate of change of B was found to be $2.50 \times 10^{–4}\;M/s$. What is the rate of change of C in this experiment?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

A certain first order reaction proceeds through t first order kinetics. The half-life of the reaction is 180 s. What percent of the initial concentration remains after 900s?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The decomposition of $N_2O_5$ is given by the following equation: $2\; N_2O_5\; (g) \rightarrow 4 NO_2\;(g) + O_2\;(g)$ At an initial $[N_2O_5]_0 = 3.15\; M$, the initial rate of reaction is $5.45 \times 10^{-5} \;M/s$ and when $[N_2O_5]_0 = 0.78\; M$, the initial rate of reaction is $1.35 \times 10^{-5}\; M/s$. What is the rate constant of this reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The reaction $A \rightarrow \text{Products}$ is second order in $A$. Initially $[A]_0 = 1.00 M$ and after $25 \; \text{mins}, \;[A] = 0.25\; M$. What is the rate constant for this reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

From the integrated rate law for a first order reaction, $ [A] = [A]_0\; e^{-kt}$. Suppose rate constant, $k = 2.95 X 10^{-3} s^{-1}$, What percent of $A$ remains after $150 \;s$?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

An elementary reaction, $2 A + C \rightarrow D$ , is second order in $A$ and first order in $C$. The rate of this reaction is $2.5 \times 10 ^{-1}1\; M/s$ when the concentrations of $A$ and $C$ are all $3.00\; mM$. What is the rate constant for the reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

A first order reaction has a rate constant of $1.00\;s^{-1}$. What is the half life of the reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Consider following reaction: $Mg(s)+2HCl(aq)\rightarrow H_2(g)+MgCl_2(aq)$.The rate of this reaction increases when more magnesium is added.This change is due to

asked Dec 19, 2013 by sreemathi.v

1 answer

For reaction $X+Y\rightarrow Z$ the reaction rate is found to depend only upon concentration of X. A plot of $\large\frac{1}{[X]}$ vs time gives a straight line. What is rate law for this reaction?

asked Dec 19, 2013 by sreemathi.v

1 answer

Which of following is incorrect?

asked Dec 19, 2013 by sreemathi.v

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Which of following statements is incorrect for a first order reaction, where $T_x$ is the time taken for the reactant to drop by that % number.

asked Dec 19, 2013 by sreemathi.v

1 answer

The rate law for decomposition of $N_2O_5: N_2O_5\rightarrow 2NO_2+\large\frac{1}{2}$$O_2$ is consistent with observed rate law.If $k'=5\times 10^{-4}s^{-1}$ the time required for $[N_2O_5]$ be reduced to 10% of its original value.

asked Dec 19, 2013 by sreemathi.v

1 answer

For thermal decomposition of ozone to oxygen:Step (i):$O_3\;\;\;\overset{\overset{k_1}{\rightleftharpoons}}{k_{-1}}\;\;\; O_2+O$.Step (ii):$O_3+O\;\;\;\underrightarrow{k_2}\;\;\;2O_2$ then rate will be $\{k_{-1}[O_2] > > k_2[O_3]\}$

asked Dec 19, 2013 by sreemathi.v

1 answer

The inactivation of a viral preparation is found to be first order reaction.If in beginning $1.5\%$ of virus is inactivated then calculate time required for 50V inactivation.

asked Dec 19, 2013 by sreemathi.v

1 answer

For following data for hydrolysis of benzene diazonium chloride $C_6H_5-N=N-Cl+H_2O\rightarrow C_6H_5OH+HCl+N_2(g)$, What is the first order calculate rate constant?

asked Dec 19, 2013 by sreemathi.v

1 answer

The gas -phase thermal decomposition of one mole of $(CH_3)_3CO_2C(CH_3)_3$ in a constant volume apparatus yields two moles of acetone and one mole of ethane.If the reaction obeys ${1^{st}}$ order then which of the following is true?

asked Dec 19, 2013 by sreemathi.v

1 answer