The universal gas constant R has more versions than a celebrity's plastic surgery! Chemistry students everywhere are breaking into cold sweats looking at this question. The correct answer? C: 8.314 J mol-1 K-1 - but only if you're using SI units like a civilized scientist. The other values are just R wearing different outfits for different unit systems. It's like the gas constant went to a costume party and nobody told the students there would be a quiz. The panic in that game show contestant's eyes perfectly captures the existential dread of every chemistry exam where you forgot which version of R to use. I still have nightmares about accidentally using atm instead of Pascals!
The Universal Gas Constant Identity Crisis

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