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What will be the percent composition by mass of a solution made by dissolving 28.4 grams of sodium acetate (NaC2H3O2) in 125 mL of water (density 1.00g/ml)? % NaC2H3O2 = % H2O = 2. How many grams of sucrose (table sugar), C12H22O11, are needed to prepare 211g of syrup that is 35.0% sucrose? 3. How many moles of sodium hydroxide, NaOH, are required to prepare 3.00 L of 0.420 M solution? 4. What will be the molarity of a solution if 4.92 grams of magnesium carbonate (MgCO3) are dissolved in water to make 450.0 mL of solution? 5. What volume of a 0.350 M solution of zinc nitrate, Zn(NO3)2 can be prepared from 6.389 g of zinc nitrate? 6. How many milliliters of 2.50 M H2SO4 are needed to prepare 500.0 mL of 0.115 M H2SO4? 7. How many grams of hydrogen chloride are in 45 mL of concentrated (12 M) HCl? 8. An ethanol solution has a density of 0.8724 g/mL and contains 68.00% ethanol (CH3CH2OH) by mass. What is the molarity of this solution? (Challenge question) If I leave 750 mL of 0.50 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be? Use the equation below to solve the following problems 2 HBr(aq) + Zn(s) ®ð ZnBr2(aq) + H2(g) a. How many milliliters of 0.2493 M HBr would be required to completely react with 25.00 grams of elemental zinc? b. How many moles of hydrogen gas will be produced by the reaction of 500.0 mL of 0.4418 M HBr and 35.00 g of elemental zinc? Oxalic acid H2C2O4 is a toxic substance found in spinach leaves The acid can be neutralized by the addition of base H2C2O4 + 2 KOH ( K2C2O4 + 2 H2O What is the molarity of a solution made by dissolving 12.0 g of oxalic acid enough water to make 400 ml of solution? How many ml of 0.230 M KOH would you need to titrate 25 ml of the oxalic acid solution? Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling some sodium bicarbonate on to the sulfuric acid. The reaction produces sodium sulfate, carbon dioxide and water. H2SO4 (aq) + NaHCO3 (s) ( Na2SO4 (aq) + CO2 (g) + H2O (l) If 35 ml of 6.0 M sulfuric acid is spilled and 50 grams of sodium bicarbonate is added, what is the mass of carbon dioxide gas (g) that is produced? How many oxygen atoms are in the carbon dioxide produced? What is the limiting reagent and how much reactant remains unreacted? 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