# What is the unit for rate constant?

## What is the unit for rate constant?

The rate constant has units of reciprocal seconds (s−1) because the reaction rate is defined in units of concentration per unit time (M/s). The units of a rate constant depend on the rate law for a particular reaction.

## What is the unit of second order reaction?

Unit of reaction rate (r) is moles per liter per second (mol. L-1. s-1) and the unit of second order rate constant is M-1. s-1 (M is molarity which can be expressed as mol/L).

**What are the units of a first-order rate constant?**

k is the first-order rate constant, which has units of 1/s. The method of determining the order of a reaction is known as the method of initial rates. The overall order of a reaction is the sum of all the exponents of the concentration terms in the rate equation.

### How do you find the rate constant k for a second order reaction?

The order of the reaction is second, and the value of k is 0.0269 M-2s-1. Since the reaction order is second, the formula for t1/2 = k-1[A]o-1. This means that the half life of the reaction is 0.0259 seconds….

1/Concentration(M-1) | Time (s) |
---|---|

3 | 30 |

### How do you find the rate constant for a second order graph?

The integrated rate law for the second-order reaction A → products is 1/[A]_t = kt + 1/[A]_0. Because this equation has the form y = mx + b, a plot of the inverse of [A] as a function of time yields a straight line. The rate constant for the reaction can be determined from the slope of the line, which is equal to k.

**What is second-order reaction?**

Definition of second-order reaction : a chemical reaction in which the rate of reaction is proportional to the concentration of each of two reacting molecules — compare order of a reaction.

#### What is first-order and second-order reaction?

A zero-order reaction proceeds at a constant rate. A first-order reaction rate depends on the concentration of one of the reactants. A second-order reaction rate is proportional to the square of the concentration of a reactant or the product of the concentration of two reactants.

#### What is the unit for second order reaction?

**What are the units for second order?**

The units of rate constants vary with the order of reaction in the same way that their dimensions vary. For a first-order rate constant, such as k in Eqn (5), the units are s-1 . For a second-order rate constant, such as k in Eqn (6), the units are dm3 mol-1 s-1 or L mol-1 s-1 or M-1 s-1.

## What are the units for the rate constant?

The units of the rate constant depend on the global order of reaction: If concentration is measured in units of mol·L−1 (sometimes abbreviated as M), then. For order (m + n), the rate constant has units of mol1−(m+n)·L(m+n)−1·s−1. For order zero, the rate constant has units of mol·L−1·s−1 (or M·s−1) For order one, the rate constant has units of s−1.

## How do you calculate the rate constant?

Calculate the rate constant in terms of oxygen per cubic meter by dividing the rate of oxygen consumption by the reaction volume: 90 kg/s divided by 0.3664 equals 245.6. Therefore, the rate constant of this reaction is 245.6 kilograms of oxygen per second per cubic meter.

**How to calculate constant rate?**

The rate constant may be found experimentally, using the molar concentrations of the reactants and the order of reaction. Alternatively, it may be calculated using the Arrhenius equation . The units of the rate constant depend on the order of reaction. The rate constant isn’t a true constant, since its value depends on temperature and other factors.