Aqueous sulfurous acid (H₂SO₃) was made by dissolving0.200 L of sulfur dioxide gas at 19C and 745 mmHg in water toyield 500.0 mL of solution. The acid solution required 10.0 mLof sodium hydroxide solution to reach the titration end point.What was the molarity of the sodium hydroxide solution?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".