Questions asked by Stacy Z.

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• Mass of candle 0.72 g before burning. What is the mass of the products of this reaction? Would that be the same thing as weighing the candle again (the mass is 0.27 g after burning)?
  
• 2C31H64 + 63O2 --> 62CO2 + 64H2O Whatmass of water will be produced in the reaction? Mass before burning 0.72 g after burning 0.27 g
  
• In lab you will be preparing five aqeous solutions of glycerine (C3H8O3), each a different predetermined %(m/m) and each to a total mass of 30 g. How many grams of deionized water should you measure to make your 20 %(m/m) solution for lab?
  
• How many grams of S were used? What is the freezing point of S in degrees C?
  
• What are the units of k in the following rate law? Rate = k[X]
  
• What is the concentration in molarity of S2O32- (aq) in a solution prepared by mixing 300 mL of 0.162 M Na2S2O3 (aq) with enough 0.126 M KCl (aq) to make a 350.0 mL solution? (Assume volumes are additive and that no chemical reactions take place.)
  
• Determine the pH of each of the following solutions. Part A:0.14 M NaC2H3O2 Part B: 0.12 M NaCl How would I solve for the pH? Do I use an ICE table?
  
• How would you determine is the following salts will from a solution that is acidic, basic, or pH neutral? CH3NH3CN, Fe(ClO4)3, K2CO3, CH3NH3CL, RbI