I think the college board was wrong Maybe I am but I don't see how

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SUMMARY

The discussion centers on a student's disagreement with the College Board's answers regarding a chemistry problem. The student argues that their reasoning for selecting CO2 as the correct answer is valid, citing that all options contain the same number of molecules and that CO2 molecules are the heaviest. The College Board's explanation emphasizes that all gases have the same average kinetic energy at the same temperature, which the student struggles to reconcile with their own logic. The student ultimately expresses confusion and seeks clarification on their reasoning.

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  • Understanding of the Ideal Gas Law (PV = nRT)
  • Basic knowledge of kinetic molecular theory
  • Familiarity with concepts of moles and molecular weight
  • Ability to interpret and analyze chemistry problems
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  • Study kinetic molecular theory and its implications for gas behavior
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This discussion is beneficial for chemistry students, educators, and anyone preparing for standardized tests that include gas law concepts and problem-solving in chemistry.

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Homework Statement


So I solved this problem and I got stuck on B and I don't agree with what the college board says is the right answer or see why my answer is mathematically wrong at all...
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and here's what the college board says please show me how my logic is wrong

5)

(a) two points

CO2

because all contain same number of molecules (moles), and CO2 molecules are the heaviest

Note: total of 1 point earned if CO2 not chosen but same number of molecules (moles) is specified

(b) two points

All are equal

because same temperature, therefore same average kinetic energy

Note: just restatement of "same conditions, etc." does not earn second point

Homework Equations





The Attempt at a Solution


 
Last edited by a moderator:
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well I feel dumb nevermind =)
 
if you want to know

PV = nRT
n = (PV)/(RT)

it is the same after all for each ballon

but I still don't see my other question in a different topic is wrong
 

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