Chemical Reactions and Reaction Stoichiometry, chemistry homework help

  1. A sample of ethane, C2H6 is found to contain 3.00 x 1022 atoms of H. How many molecules of C2H6 are present? 
  2. Calculate the molar mass of menthol, C10H20O.
  3. 20.0 g Na2CO3 has how many moles of Na+
  4. 15.0g Al(NO3)3 has how many NO3?
  5. Determine the number of moles of aluminum in 96.7 g of Al.
  6. 8.00 g of C6H6 has how many H atoms?
  7. 15.0 g NH3 has how many moles of H atoms? 
  8. The mass of 1.21 x 1020 atoms of sulfur is
  9. How many Nitrogen atoms are present in 1.0 x 109 molecules of Aspartame,  C14H18N2O5.
  10. Consider the reaction: 3H2 + N2 –> 2NH3. If a mixture of 3.0 mole of H2 and 3.0 mole N2 is taken, how many moles of excess reactant remain unused?
  11. A compound of Boron & Oxygen has 31.05% B and 68.95% O. What is its empirical formula? 
  12. Consider the reaction: 2H2 + O2 –> 2H2O. If a mixture of 1.0 mole of H2 and 1.0 mole O2 is taken, how many grams of H2O can form? 
  13. What is the coefficient of N2 when the following equation is properly balanced with the smallest set of whole numbers?
  14.  _____N2H4+ _____N2O4 à  ___?__N2+ _____ H2O 

  15. Balance the following equation using the smallest possible integers and determine the coefficient of HCl? 
  16. Fe2S3 + HCl –> FeCl3 + H2S

  17. The fermentation of glucose C6H12O6 produces ethanol, C2H5OH and CO2.The equation for the reaction is as follows: C6H12O6 –> 2C2H5OH  + 2CO2. 
  18. How many moles of CO2 are produced when 0.400 moles of C6H12O6 are used?

  19. The fermentation of glucose C6H12O6 produces ethanol, C2H5OH and CO2.The equation for the reaction is as follows: C6H12O6 –> 2C2H5OH  + 2CO2. 
  20. How many grams of C2H5OH  are produced when 0.400 moles of C6H12O6 are used?
  21. When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is
  22. __ C3H5OH+ __ O2 –> __ CO2 + __ H2O

  23. Which of the following is not correct?

Select one:

a. 1mol of Cl2 has 35.45 g Cl

b. 1mol of NaCl has 6.022 x 1023 Na+

c. 1 mole of Ca3N2 has 3 moles Ca+2

d. 1 mol of O3 has 1.81 x 1024 O atoms

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