Tuesday, December 5, 2017

STOICH 2

 EASY STOICHIOMETRY PROBLEMS

1)      How many moles of sodium atoms correspond to 1.56x1021 atoms of sodium?

2)      How many moles of Al atoms are needed to combine with 1.58 mol of O atoms to make aluminum oxide, Al2O3?


3)      How many moles of Al are in 2.16 mol of Al2O3?



4)      Aluminum sulfate, Al2(SO4)3, is a compound used in sewage treatment plants. 

a.     Construct a pair of conversion factors that relate moles of aluminum to moles of sulfur for this compound

b.     Construct a pair of conversion factors that relate moles of sulfur to moles of Al2(SO4)3

c.       How many moles of Al are in a sample of this compound if the sample also contains 0.900 mol S?

d.     How many moles of S are in 1.16 mol Al2(SO4)3?



5)      How many moles of H2 and N2 can be formed by the decomposition of 0.145 mol of ammonia, NH3?

ANSWERS:

1)      2.59x10-3mol Na atoms  
2)      1.05mol Al                

3)      4.32mol Al

4)      a. 2mol Al/3mol S            b. 3mol S/1mol Al2(SO4)3            c. 0.600mol Al     d. 3.48mol S

5)      0.0725mol N2 and 0.218mol H2

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