Which of the following is the correct equation to calculate the relative molecular mass of a gas?
Correct answer: D. M = mRT / PV
- A. M = mPR / VT
- B. M = PV / mRT
- C. M = mPRT / V
- D. M = mRT / PV
Explanation
Since PV=NRT where n = m / M PV=MRT / M M=mRT / PV.
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About Ideal Gas Equation
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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