# 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.