## What are the units for k rate?

Reaction Order and Rate Constant Units

Reaction Order | Units of k |
---|---|

first | s−1 |

second | L/mol/s |

third | mol−2 L2 s−1 |

Table 7. Rate Constants for Common Reaction Orders |

### What is k in a reaction rate?

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.

**What are the units of k in rate k x 2?**

For a given reaction with a rate=k[X]2 r a t e = k [ X ] 2 the rate of reaction is second order. Therefore the units for k are 1M. s.

**What is k in first order reaction?**

‘k’ is the rate constant of the first-order reaction, whose units are s-1. ‘[A]’ denotes the concentration of the first-order reactant ‘A’. d[A]/dt denotes the change in the concentration of the first-order reactant ‘A’ in the time interval ‘dt’.

## What are the units of k in the following rate law rate k x ][ y 1 2?

Chemical Kinetics

Question | Answer |
---|---|

What are the units for K in Rate= k[X] and k[X]^0[Y]^0? | 1/s |

What are the units for K in Rate= k[X][Y]^1/2? | M-1/2s-1 |

What are the units for K in Rate= k[X]^2? | M-1s-1 |

Which of the following represents the integrated rate law for a first-order reaction? | ln[A]t/[A]o= -kt |

### What are the units of k for a second-order reaction?

where k is a second order rate constant with units of M-1 min-1 or M-1 s-1. Therefore, doubling the concentration of reactant A will quadruple the rate of the reaction.

**What is the unit for k in a third order reaction?**

JEE 2-Year (2022-24)

Reaction Order | Units of k |
---|---|

Zero | mol/L/s |

First | s-1 |

Second | L/mol/s |

Third | mol-1 L2 s-1 |

**Why is k Unitless?**

Because equilibrium constants are calculated using “effective concentrations” relative to a standard state of 1 M, values of K are unitless.

## What are the units of k in a third order reaction?

What is the unit of rate constant of the third order reaction? mol-2L2s-1 is the unit of third order reaction.

### What are the units of k in a fourth order reaction?

Therefore, the unit of k is (mol/L)−3t−1 for fourth order reaction.

**Does K equilibrium have units?**

The units of Equilibrium constant K will depend on the number of moles of reactants and products. Hence, it is concluded that equilibrium constant K has no units i.e. dimensionless if the total number of moles of products is equal to the total number of moles of reactants.

**How is K dimensionless?**

Equilibrium Constant Expressions for Systems that Contain Gases. Like K, Kp is a unitless quantity because the quantity that is actually used to calculate it is an “effective pressure,” the ratio of the measured pressure to a standard state of 1 bar (approximately 1 atm), which produces a unitless quantity.

## What is K in first-order reaction?

### What is t1 2 of zero order reaction in terms of K?

Therefore, the formula of t1/2 for a zero order reaction is 2k.