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CHEM 111 (69)

Stoichiometry, aqueous ionic reactions, molecular equation, total ionic equation, net ionic equation

4 Pages

Course Code
CHEM 111
Dana Johnson

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10 November Announcements Practice exam tonight A103, 7-9 pm CHEM 180 for next semester Experimental recitation for CHEM 113 Optional, not connected to lecture Only homework would be model-type assignments In-class, worksheet based class Refined model assignment Molecular-level interaction Due Wed, 11 / 17 2 Mg (s) + O (g) → 2 MgO (s) 2 How much MgO is formed if 30 g of Mg reacts completely? 1.2 mol MgO x (2431 + 16) g / 1 mol MgO = 50 g MgO At STP, how many liters of O a2e needed to completely react those 30. g of Mg? 30 g Mg x 1 mol Mg / 24.31 g x 1 mol O / 2 2ol Mg x 22.4 L / 1 mol O 2 14 L of O2 Stoichiometry The study of the quantitative aspects of chemical formulas and reactions The coefficients of a formula give the stoichiometric ratios of compounds in a reaction Solution example Given the following equation: NaOH (s) + HCl (aq) → NaCl (aq) + H O (l2 How many liters of a 10.0 M solution of HCl would react with 5.00 g of solid NaOH? 5 g NaOH → L HCl sln 5 g NaOH x (1 mol NaOH / 40 g NaOH) x (1 mol HCl / 1 mol NaOH) x (1 L HCl / 10 moles HCl) = 0.0125 L 12.5 mL A group of students determines the ion crowdness index of a 15.0 L solution to be 6.00 moles of ions per liter of solution. If 25.0 liters of water are added to the solution, what is the ion crowdness index of the new solution? A. 0.15 moles of ions / liter of solution B. 2.25 moles of ions / liter of solution C. 3.60 moles of ions / liter of solution D. 6.00 mole
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