A sample contains an unknown amount of the mineral siderite, FeCO3. If 0.6050 g of the sample requires 40.08 mL of 0.1000 M HCl to neutralize the FeCO3 completely, what is the percentage of FeCO3 in the sample? The molar mass of FeCO3 is 115.86 g/mol. The balanced equation for the reaction is: FeCO3 + 2 HCl → H2O + CO2 + FeCl2

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.