A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding 650.0 ml of 1.0M HCl at 20oC. The final temperature of the solution after reaction is 21.066 oC. A drop of phenolphthalein is added to the solution and it remains colorless. Assume the specific heat capacity of the solution is 4.18j/goC.

Question

A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are neutralized by adding 650.0 ml of 1.0M HCl at 20oC. The final temperature of the solution after reaction is 21.066 oC. A drop of phenolphthalein is added to the solution and it remains colorless. Assume the specific heat capacity of the solution is 4.18j/goC.
Substance		∆Hf (kJ/mol)
Ba+2(aq)		-538.4
Cl- (aq)			-167.4
Ca+2(aq)			-543.0
H2O (l)			-286
CO2(g)			-393.5
HCl (aq)			-167.2
CaCO3 (s)		-1207
BaCO3 (s)		-1213
Find the initial pressure of the CO2(g) and mass percents of BaO and CaO in the mixture.
The solution is then titrated with NaOH until the solution turns pink. This requires the addition of 275.0 ml of NaOH. Calculate the molarity of the NaOH.