## Chemistry and Chemical Reactivity (9th Edition)

$C_4H_6O_4$
Empirical formula ($C_2H_3O_2$)'s molar mass: $M_u=59.04\ g/mol$ Molar mass: $M=118.1\ gmol$ Number of units $M/M_u=2.0$ So the molecular formula is $C_4H_6O_4$