why is that molecules with bigger molecular weight have fewer moles?

[I GET BUCKETS]

for example, compound #2 has fewer moles than compound #1, but why?

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[dr_stevebrule]

View attachment 247683

for example, compound #2 has fewer moles than compound #1, but why?

do you mean 2 has fewer mol/[unit weight] than 1? That would make sense, because if we want 1 gram of each compound, and compound 2 weighs more than compound 1, it would require fewer molecules (i.e. fewer moles) to reach 1 gram of compound 2 than compound 1.