45_practice_3rd_exam_sp16-2 - FLORIDA INTERNATIONAL...

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FLORIDA INTERNATIONAL UNIVERSITY DEPARTMENT of CHEMISTRY AND BIOCHEMISTRY BISCAYNE BAY CAMPUS Name: _________________________________ CHM 1045 Panther ID: __________________________________ Third Exam Lab Instructor: _________________________ Useful Information: Molar Mass (g/mol) Equations C 3 H 8 = 44.09 Mg(OH) 2 = 58.33 N 2 H 4 = 32.04 Al 2 O 3 = 101.96 N 2 O 4 = 92.01 NO = 30.01 MgCl 2 = 95.21 1 mol = 6.022 x10 23 atoms M = moles/L Δ U = q + w Spht (H 2 O) = 4.184 J/ g ºC ΔH vap (H 2 O) = 40.67 kJ/mol ΔH melt (H 2 O) = 6.003 kJ/mol 1 cal = 4.184 J q released = - q absorbed = - (q sol n + q cal) q = m x spht x Δ T q cal = C cal x Δ T q = n Δ H change Δ H = Σ (n Δ H for ) prod - Σ (n Δ H for ) reactants Δ H = Σ(nΔH brea_bond ) - Σ(nΔH form_bond ) 1 Cal = 1000 cal
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1. Which of the following changes will not affect the molarity of a solution? a. Dispensing 50 mL of the solution b. Adding solute to the container c. Allowing the solution to evaporate d. Adding water to the solution e. All will change the molarity of the solution 2. Which of the following compounds will produce the solution with the highest conductivity? 3. A 4.691 g sample of MgCl 2 is dissolved in enough water to give 750 mL of solution. What is the chloride ion concentration in this solution? 4. Sodium metal reacts with water to produce sodium hydroxide (NaOH) and hydrogen gas (H 2 ). Write a balanced equation for this reaction. a. 2 2 Na + H O NaOH + H b. 2 2 Na + NaOH H O + H c. 2 Na NaOH + H d. 2 2 2 Na + 2 H O 2 NaOH + H Use the following table to answer the next two questions. Hydrogen gas and oxygen gas combine in the proportions shown to produce water. 2 H 2 (g) + O 2 (g) 2 H 2 O (l) Mixture Moles of H 2 Moles of O 2 Maximum moles H 2 O formed Moles of excess reagent A 7 3 B 10 6 C 11 4 D 8 3 E 9 6
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  • Fall '12
  • Winkle
  • Chemistry, Sodium chloride, Sodium hydroxide

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