## What is the unit of K constant?

The Coulomb constant, the electric force constant, or the electrostatic constant (denoted ke, k or K) is a proportionality constant in electrostatics equations. In SI units it is equal to 8.9875517923(14)×109 kg⋅m3⋅s−2⋅C−2….Coulomb constant.

Value of k | Units |
---|---|

10−7 | (N·s2/C2)c2 |

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

Because the units of the reaction rate are always moles per liter per second, the units of a first-order rate constant are reciprocal seconds (s−1).

**How do you find rate constant units?**

To find the units of a rate constant for a particular rate law, simply divide the units of rate by the units of molarity in the concentration term of the rate law.

### Is the rate constant for a first order reaction is K the time required for the completion of 99% of the reaction is given by?

For a first-order reaction, the time required for 99.0% completion is twice for the time required for the completion of 90% of the reaction.

### What are units of first-order reaction?

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

#### What is first order reaction?

Definition of first-order reaction : a chemical reaction in which the rate of reaction is directly proportional to the concentration of the reacting substance — compare order of a reaction.

#### Which is true for first order reaction?

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

**What is the difference between first order reaction and second order reaction?**

The key difference between first and second order reactions is that the rate of a first order reaction depends on the first power of the reactant concentration in the rate equation whereas the rate of a second order reaction depends on the second power of the concentration term in the rate equation.

## What is a first order reaction rate?

In a first-order reaction, the reaction rate is directly proportional to the concentration of one of the reactants. First-order reactions often have the general form A → products. The differential rate for a first-order reaction is as follows: rate=−Δ[A]Δt=k[A]