CHEM120 Week 3 Assignment: Stoichiometry and Solution Chemistry – 100% Correct Answers

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CHEM120 Week 3 Assignment: Stoichiometry and Solution Chemistry – 100% Correct Answers Week 3 Assignment: 15 points 1. Balance these chemical reactions: (2 point each, 8 points total) 2 NaBr +... 1 CaF2 → 2 NaF + 1 CaBr2 2 HCl + 1 CaCO3 → 1 CaCl2 + 1 H2O + 1 CO2 1 FeCl3 + 3 NaOH → 1 Fe(OH)3 + 3 NaCl 1 CaCO3 + 1 H2SO4 → 1 CaSO4 + 1 CO2 + 1 H2O 2. Calculate the formula mass of Al2(SO4)3. (2 points) 342.15 g/mol 3. Calculate the mass of 2.5 moles of NaOH. (1 points) 99.75 g/mol 4. For the balanced chemical equation: 2 K + 1 MgBr2 → 2 KBr + 1 Mg Answer the following questions: a. If you produce 7 mols of KBr, how many mols of MgBr2 did you need? (1 point) 1 mol b. If I have 2 moles of MgBr2, how much KBr can I make in moles? (2 points) 2.6 grams of KBr can make in moles 5. You are making 100 ml of a 2 M solution of HCl. How many ml of a 4 M HCl solution will you require? (2 points) Volume = moles/concentration 200 mL 6. Calculate Volume/volume% of a solution made by dissolving 50 ml Ethanol in 250 ml H2O. (1 point) Volume: 250 mL Volume of solution: 50+250= 200 mL 7. A solution with a total volume of 2.5 liters is composed of 31.4 grams of Na2S in water. What is the: a. molarity of this solution? (1 point) 0.16 m b. Osmolarity of the solution (1 point) 0.48 osmolarity c. the % Mass/Volume of this solution? (1 point) 1.26% mass volume [Show More]

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