H2SO4 + Na2CO3 --> Na2SO4 + H2O + CO2 In a titration where H2SO4 is added from a buret to an aqueous solution of 0.850 g Na2CO3, 46.75 mL of H2SO4 are needed to reach the permanent endpoint of the titration.

A) Find the number of moles of Na2CO3 in the reaction.

B) Find the number of moles of H2SO4 in the reaction.

C) Find the mass/mass % of H2SO4 based on the above information about reaching the endpoint of the titration.

The molar mass of Na2CO3 is 105.99 g/mol. The molar mass of H2SO4 is 98.08 g/mol. The density of H2SO4 is 0.985 g/mL.

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.