# 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