Help with density problem?

A flask has a m of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its m is 1026.57 g. What is the density of concentrated sulfuric acid? (ume water has a density of 1.00 g/cm3 at the temperature of the measurement.) Please make sure you round to the appropriate number of significant figures.