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Past Exam for CHM 1045C - Gen Chem with Qual Analysis I at Valencia Comm College (VCC)

Exam Information

Material Type:Exam 2
Professor:Staff
Class:CHM 1045C - Gen Chem with Qual Analysis I
Subject:CHM: Chemistry
University:Valencia Community College
Term:Spring 2008
Keywords:
  • Concentration
  • Precipitate
  • Empirical Formula
  • Chemical Equation
  • Following Reactions
  • Partial Credit
  • Points Extra Credit
  • Limiting Reactant
  • Correct Number
  • Ionic Equation
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Sample Document Text

CHM 1045 Spring 2008 Test 2 Name (print)___________________ Show your work for complete (and partial) credit. Report your answers to the correct number of significant figures, and use units where appropriate. NA=6.022x1023 1. a) What is the mass of one (average) sodium atom in amu? b) What is the mass of one (average) sodium atom in grams? 2. What is the definition of the mole? The following information applies to the next four problems. Compound: MgCl2 Mg(NO3)2 AgCl AgNO3 f.w.(g/mol): 95.211 148.435 143.321 169.87 MgCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Mg(NO3)2(aq) 3. How much does 0.055mol of magnesium chloride weigh? 4. How many mols of AgNO3 are required to form 0.275mol of AgCl? 5. What mass of MgCl2 is required to form 1.223g of AgCl? 6. An impure sample of MgCl2(s) weighing 0.505g was dissolved in 100.mL of water. Excess AgNO3(aq) was added to completely react the MgCl2(aq). The AgCl precipitate was filtered, dried, and weighed. It weighed 0.406g. What was the purity of the...

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