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Stiochemistry practice problems! help

  • Thread starter LraeByrne
  • Start date
  • #1
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Homework Statement



Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide?

Homework Equations



first equation:Al + O2 --> Al2O3 i balanced it at 4Al + 3O2 --> 2Al2O3

The Attempt at a Solution



okay I just really need help understanding this because I have no clue what I am doing and don't understand how to work the problem! please help:confused:
 

Answers and Replies

  • #2
cristo
Staff Emeritus
Science Advisor
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Ok, so you've balanced your equation correctly. From this you know that 4 moles of aluminium produce 2 moles of aluminium oxide, and want to calculate the number of moles of Al required to produce 3.4 moles of aluminium oxide (x, say).

1. What is the ratio of Al to Al2O3?
2. Can you set up a ratio equation for x?
 
  • #3
Borek
Mentor
28,360
2,753

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