What mass in grams of co2 was evolved? the balanced, Ask an Expert

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Exactly 0.1120 g of pure Na2CO3 was dissolved in 100.0 mL of 0.0497 M HClO4. a) What mass in grams of CO2 was evolved? The balanced equation I set up is: Na2CO3 + 2HClO4 --> NaClO4 + CO2 + H2O Now what? b) What was the molarity of the excess reactant (HCl or Na2CO3)?

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