Biology Possible Tripeptide Chains: Calculating the Theoretical Combinations

Ryan1983
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Homework Statement


A tripeptide chain consists of three amino acids, which can be distinguished as first, second and third. Each is one of 20 naturally occurring amino acids. How many tripeptide chains are theoretically possible?

Homework Equations

The Attempt at a Solution


would it simply be 20x20x20=8000?
 
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Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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