MDCAT
Chemistry
Chemistry · States of Matter - Gases, Liquids and Solids
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Question
The value of R in atm.dm3.mol-1.K-1 is:
Options
- A
0.0821
- B
0.821
- C
62.4
- D
8.314
Explanation
The correct value of R in the units of atm.dm3.mol-1.K-1 is 0.0821. This value is derived from the ideal gas law, PV = nRT, where R is the universal gas constant. The units of R vary depending on the units of pressure, volume, and temperature used. Options B (0.821) and C (62.4) are incorrect as they do not correspond to the proper value of R in the specified units. Option D (8.314) is another common value for R, but it is expressed in different units (J.K-1.mol-1), making it unsuitable for this question.
This is the correct value of R when expressed in atm.dm3.mol-1.K-1. It is often used in calculations involving gases under standard conditions.
This value is incorrect. It does not correspond to any standard value of R used in gas law calculations.
This value is incorrect for R in the specified units. It is actually the value of R in L.torr.K-1.mol-1.
While this is a common value for R (in J.K-1.mol-1), it is not the correct value when expressed in atm.dm3.mol-1.K-1.
Tagged under Chemistry · States of Matter - Gases, Liquids and Solids