## Chemistry the rate of reactions

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taylorswift08
Full Member Posts: 11
Joined: Mon Mar 20, 2023 8:36 am

### Chemistry the rate of reactions

Under experimental conditions, at a temperature of 320°C, one mole of NOBr decomposes according to the reaction NOBr= NO +1/2 Br2. The coefficients before the formulas of the substances in the reaction are simultaneously the values ​​of powers of their concentrations. Calculate how many moles of NOBr are left unreacted if it is heated for 5 hours and the rate constant is 2.2* 10^-5 mol^¹* s^-1
ChenBeier
Distinguished Member Posts: 1308
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Chemistry the rate of reactions

Calculate the moles consumed = time × K

We have 1 mol NOBr - consumed moles = moles left
taylorswift08
Full Member Posts: 11
Joined: Mon Mar 20, 2023 8:36 am

### Re: Chemistry the rate of reactions

is the moles consumed = time × K a formula that is givven in school or?
ChenBeier
Distinguished Member Posts: 1308
Joined: Wed Sep 27, 2017 7:25 am
Location: Berlin, Germany

### Re: Chemistry the rate of reactions

In the exercise K 2.2* 10^-5 mol^¹* s^-1 and time 5 h is given.

But probably has to use Arrhenius equation

A(t) = A0* exp(-kt)