 # GS Free Sample Test Section III Question 16

### GS Free Sample Test Section III Question 16

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viv.goldstandard

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Joined: Tue Feb 09, 2016 3:07 pm

### Re: GS Free Sample Test Section III Question 16

I think lnK is directly proportional to 1/T. I don't understand how lnK= lnA + -Ea/RT changes to
lnK= -Ea/R(1/T) +lnA. How does Ea/RT become Ea/R(1/T)??
sahar85ihs7898

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Joined: Sun Jan 24, 2021 11:27 am

### Re: GS Free Sample Test Section III Question 16

sahar85ihs7898 wrote:I think lnK is directly proportional to 1/T. I don't understand how lnK= lnA + -Ea/RT changes to
lnK= -Ea/R(1/T) +lnA. How does Ea/RT become Ea/R(1/T)??

Manipulating fractions and variables represent a common GAMSAT Section 3 question-type.

Ea/RT can be written in many equivalent ways:

Ea/RT = Ea (1/RT) = Ea/R (1/T)

If you are unsure, you can also replace the 3 variables with numbers and you will have the same answer.

Keep in mind that the reason for expressing the relationship as "-Ea/R (1/T)" is that the graph has 1/T on the x-axis so it is necessary to find 1/T in the original equation provided.
goldstanda3269

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