# How to do rate law

## How do you determine rate law?

In order to determine a rate law we need to find the values of the exponents n, m, and p, and the value of the rate constant, k. If we are given the reaction orders for a reaction, we have the values of the coefficients we need to write the rate law.

## How do you determine rate order?

The overall order of the reaction is found by adding up the individual orders. For example, if the reaction is first order with respect to both A and B (a = 1 and b = 1), the overall order is 2. We call this an overall second order reaction.

## What is the formula of rate constant?

The rate law for a zero-order reaction is rate = k, where k is the rate constant. In the case of a zero-order reaction, the rate constant k will have units of concentration/time, such as M/s.

## What are the units of rate law?

The sum of the concentration term exponents in a rate law equation is known as its reaction order. We can also refer to the relationship for each reactant in terms of its exponent as an order.

Reaction Order.Reaction OrderUnits of rate constantZero-orderM s-1First-orders-1Second-orderL mol-1 s-1

## How do you find the rate law experimentally?

In order to experimentally determine a rate law, a series of experiments must be performed with various starting concentrations of reactants. The initial rate law is then measured for each of the reactions.

## How do you calculate initial rate of reaction?

The initial rate of a reaction is the instantaneous rate at the start of the reaction (i.e., when t = 0). The initial rate is equal to the negative of the slope of the curve of reactant concentration versus time at t = 0.

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## What does rate order mean?

The order of a rate law is the sum of the exponents of its concentration terms. Once the rate law of a reaction has been determined, that same law can be used to understand more fully the composition of the reaction mixture.

## What is the first order of reaction?

A first-order reaction is a reaction that proceeds at a rate that depends linearly on only one reactant concentration.

## What is a rate constant k?

The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants. The rate law and the specific rate constant for any chemical reaction must be determined experimentally. The value of the rate constant is temperature dependent.