Aspirin, ${\mathrm{C}}_9{\mathrm{H}}_8{\mathrm{O}}_4$, is prepared by the acetylation of salicylic acid, ${\mathrm{C}}_7{\mathrm{H}}_6{\mathrm{O}}_3$, according to the following equation:
${\mathrm{C}}_7{\mathrm{H}}_6{\mathrm{O}}_3+({\mathrm{CH}}_3\mathrm{CO}{)}_2\mathrm{O}⟶{\mathrm{C}}_9{\mathrm{H}}_8{\mathrm{O}}_4+{\mathrm{CH}}_3\mathrm{COOH}$
If the yield of this reaction is 83%, what mass of salicylic acid would be required to prepare 1.0kg of aspirin?