Section 12.1 Counting Particles of Matter

Practice Test
      
  1.A direct measurement on a sample of pure substance can be converted to a count of the number of particles through ________________.  
  a.   geometry  
  b.   stoichiometry  
  c.   telemetry  
  d.   theory  
  Hint    
      
  2.The number of things in one mole is the ________________.  
  a.   Avogadro constant  
  b.   gram  
  c.   atomic mass unit  
  d.   kilogram  
  Hint    
      
  3.How many hydrogen atoms are in one mole of hydrogen molecules?  
  a.   12.04 × 1023  
  b.   6.02 × 1023  
  c.   2.02  
  d.   1.01  
  Hint    
      
  4.What is the molar mass of arsenic?  
  a.   74.9 g/mol  
  b.   74.9 u/mol  
  c.   33 lb/mol  
  d.   33 kg/mol  
  Hint    
      
  5.What is the molar mass of carbon dioxide?  
  a.   6.02 × 1023 g/mol  
  b.   12.0 g/mol  
  c.   32.0 g/mol  
  d.   44.0 g/mol  
  Hint    
      
  6.How many moles of sucrose, C12H22O11, are in 1222 g of sucrose?  
  a.   0.258  
  b.   1.22  
  c.   3.57  
  d.   10.8  
  Hint    
      
  7.How many moles of calcium are in 0.544 g of calcium?  
  a.   0.0136  
  b.   0.0773  
  c.   0.554  
  d.   3.11  
  Hint    
      
  8.What is the mass of 2.40 mol of copper?  
  a.   152 g  
  b.   26.5 kg  
  c.   3.78 mg  
  d.   5.65 g  
  Hint    
      
  9.How many atoms are in 34.6 g of carbon?  
  a.   1.73 × 1024  
  b.   12.1 × 1023  
  c.   2.88  
  d.   0.00554  
  Hint    
      
  10.Determine the number of atoms in 3.54 mol S.  
  a.   1.70 x 10 23  
  b.   1.70 x 10 24  
  c.   2.13 x 10 23  
  d.   2.13 x 10 24  
  Hint    
      
  11.Calculate the mass in grams of 0.0790 moles of aluminum.  
  a.   1.0 g  
  b.   2.1 g  
  c.   21 g  
  d.   34 g  
  Hint    
      
  12.How many moles of chlorine are in 100 g chlorine (Cl)?  
  a.   0.355  
  b.   2.82  
  c.   64.6  
  d.   100  
  Hint    
      
  13.How many atoms of carbon are in a pure sample of carbon having a mass of 72.0 g?  
  a.   3.6 x 10 24  
  b.   36 x 10 24  
  c.   3.6 x 10 23  
  d.   4.33 x 10 25  
  Hint    
      
  14.Calculate the number of moles of hydrogen atoms in 4.75 mol sulfuric acid.  
  a.   2.38 mol  
  b.   4.75 mol  
  c.   9.50 mol  
  d.   33.2 mol  
  Hint    

 
   
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