### 7A3

Posted:

**Mon Mar 09, 2020 3:24 pm**Aren't the answers supposed to be opposite of each other because one is rate of formation and one is rate of consumption?

Created by Dr. Laurence Lavelle

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https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=145&t=61820

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Posted: **Mon Mar 09, 2020 3:24 pm**

Aren't the answers supposed to be opposite of each other because one is rate of formation and one is rate of consumption?

Posted: **Mon Mar 09, 2020 3:44 pm**

Since the equation has 3 moles of O2 on the reactant side, the rate at which oxygen reacts will be 3 times the rate of reaction

Similarly, since the equation has 2moles of H2O on the product side, the rate at which water forms will be 2 times the rate of reaction

Similarly, since the equation has 2moles of H2O on the product side, the rate at which water forms will be 2 times the rate of reaction

Posted: **Mon Mar 09, 2020 4:17 pm**

we know from the unique rate equations for a reaction:

aA + bB --> cC + dD

the rate = -(1/a)d[A]/dt, -(1/b)d[B]/dt, (1/c)d[C]/dt, (1/d)d[D]/dt.

The stoichiometric coeff goes on denominator of the rate of production or consumption. I think this should help you.

aA + bB --> cC + dD

the rate = -(1/a)d[A]/dt, -(1/b)d[B]/dt, (1/c)d[C]/dt, (1/d)d[D]/dt.

The stoichiometric coeff goes on denominator of the rate of production or consumption. I think this should help you.