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SAT Chemistry

Category - Multiple Choice

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Which of the following expressions correctly gives the units for the ideal gas constant, R?

(atm)(K) / (mol)(l)
(atm)(K)(mol) / (l)
(atm)(mol) / (l)(K)
(atm)(l) / (mol)(K)
(mol)(K) / (atm)(l)

Explanation

Answer: (atm)(l) / (mol)(K)

To solve this problem, consider the ideal gas law, PV=nRT. Rearranging this expression to isolate R gives the equation R=PV/nT. This expression indicates that the correct units for the ideal gas constant are (atm)(l) / (mol)(K).

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