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Measured values of the pressure, volume and temperature of a known mass of a gaseous compound are to be substituted into the equation $PV = nRT$ - CIE - A-Level Chemistry - Question 7 - 2013 - Paper 1

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Measured values of the pressure, volume and temperature of a known mass of a gaseous compound are to be substituted into the equation $PV = nRT$. The measurements ... show full transcript

Worked Solution & Example Answer:Measured values of the pressure, volume and temperature of a known mass of a gaseous compound are to be substituted into the equation $PV = nRT$ - CIE - A-Level Chemistry - Question 7 - 2013 - Paper 1

Step 1

Which conditions of pressure and temperature would give the most accurate value of $M_m$?

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Answer

To determine the most accurate conditions for measuring the relative molecular mass (MmM_m) using the equation PV=nRTPV = nRT, we must consider how pressure and temperature affect gas behavior.

  1. Low Pressure: At low pressure, the gas behaves more ideally, meaning deviations from the ideal gas law are minimized. This is crucial for accurate calculations of MmM_m.
  2. High Temperature: Higher temperatures increase the kinetic energy of the gas molecules, further promoting ideal gas behavior.

Considering the options, the best choice is C, which states low pressure and high temperature, as it optimally allows the gas to behave ideally and leads to a more accurate determination of MmM_m.

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