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CALCULATING ON THE SIDE OF SUCCESS – Module 2021: AVOGADRO’S LAW, MOLAR GAS VOLUME & pV = nRT

 E.  AVOGADRO'S LAW, MOLAR GAS VOLUME &  pV = n R T

 E1.  INTRODUCTION & LOGICAL SEQUENCE: LENGTH -> AREA -> VOLUME 

It is not a particularly difficult task to measure precisely the mass of a particular amount of gas. However, frequently it is far easier to determine gaseous volumes.  Historically, the ratios of volumes of gases that combine with one another helped lay the foundations of Stoichiometry during the first half of the 19th century.

Volume, V, area, A, and length, , are three physical quantities important not only in their own right but also because they are involved in numerous derived physical quantities like opposite.
It follows, therefore, that one must be comfortable dealing with the relationships between length,
, area, A, and volume, V
, expressed in a variety of units and inter-converting these.

In dealing with the physical quantity volume, the units involved, and particularly the inter-conversion of cm   and  dm , have the capacity to confuse.  For the student who applies quantity algebra systematically, the procedures involved here are routine.

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2021_Molar_gas_volume_amounts_pVnRT_v1nO

Initially, it is likely to be beneficial for commonly used units of length (1-D) to be considered before moving to units of area (2-D), then finally arriving at volume (3-D).

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