Chemistry 3. (6%) Ca(HCO3 ) 2 is called calcium bicarbonate. It is one of the most abundant compounds in water, the hardness of this water sample is measured at 162 mg/L as CaCO 3 . Determine 3a. Molar concentration of HCO 3- ions (2%) 3b. Normal concentration of Ca 2+ ions. (2%) 3c. Mass fraction of calcium bicarbonate (Ca(HCO 3 ) 2) (2%) 4. (2%) Percentage of each gas in dry air is listed in the table below. Currently, the percentage of nitrogen gas (N2 ) is 77%. Determine the percentage of O2 gas, CO2 gas, Ar gas and H2 O in the moist air. Gas Percentage N2 78.08

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