A 0.824-g sample of impure solid Na2CO3 is neutralized by 43.60 mL of 0.3077 M H2SO4. What mass of Na2CO3 was contained in the sample? There are no acidic or basic impurities present in the sample. 0.4977 g 0.5210 g 0.5106 g 1.422 g 0.4624 g