. . . "\"Mass fraction\" is used in the construction \"mass_fraction_of_X_in_Y\", where X is a material constituent of Y. It means the ratio of the mass of X to the mass of Y (including X). A chemical or biological species denoted by X may be described by a single term such as \"nitrogen\" or a phrase such as \"nox_expressed_as_nitrogen\". The chemical formula of CFC115 is CClF2CF3. The IUPAC name for CFC115 is 1-chloro-1,1,2,2,2-pentafluoroethane."@en . . . "2019-05-14 17:27:19.0" . "SDN:P07::CF12N353" . "false" . . . "2019-05-14 17:27:19.0" . . "SDN:P07::CF12N353" . "" . "accepted"@en . "3" . "SDN:P07::CF12N353" . . "mass_fraction_of_cfc115_in_air"@en . "3" . .