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An organic alkyl radical such as methyl, ethyl, propyl, butyl, pentyl etc. 'R' is used when the reaction in which the substance is used is a generic reaction that would be the same whatever the radical.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoWhen written out as a structure or chemical formula "side groups" are often written out as "R". This indicates that the structure that has been drawn is a sort of back-bone structure that can have many different side groups (such as a methyl group, an alcohol etc....).
Wiki User
∙ 8y agoIt is generally used as a shorthand notation for a substituent added to the main compound. For example, the general formula for a carboxylic acid could be written as R-COOH where R = CH3, CH3CH2, CH3CH2CH2, etc. or R = CnH2n+1.
Wiki User
∙ 13y agoR represents an Alkyl group such as Methyl(CH3) and Ethyl(C2H5)
Wiki User
∙ 14y agoIf you are talking about the Ideal Gas Law (PV=nRT) then the R equals 0.0821 (atm L/ mols K) or 8.314 (kPa L/mols K).
Wiki User
∙ 7y agoThis is the universal constant of gases.
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