Problem Set 4 Answer Key .pdf
File information
Original filename: Problem Set 4 Answer Key.pdf
Author: Robert Bauer
This PDF 1.5 document has been generated by Microsoft® Word 2013, and has been sent on pdf-archive.com on 16/09/2016 at 00:48, from IP address 50.164.x.x.
The current document download page has been viewed 246 times.
File size: 265 KB (1 page).
Privacy: public file
Share on social networks
Link to this file download page
Document preview
Chemistry Lesson: Steemit Edition Problem Set 4
1.) Balance the following chemical reaction: Fe2O3 (s) + Al (s) Al2O3 (s) + Fe (s)
This reaction is the thermite reaction, it was used in the 1800’s to weld railroads together before
the advent of the modern welding techniques, it is my personal favorite chemical reaction
because of how it looks! For reference check out this video of it:
(https://youtu.be/M3ZkoNF2ybg)
Fe2O3 (s) + 2 Al (s) Al2O3 (s) + 2 Fe (s)
2.) Using the balanced reaction above. We reacted 0.7 mol of Fe2O3 with 1 mol of Al, and obtained
41 g of iron (Fe). What is our percent yield from the thermite reaction we performed?
0.7 𝑚𝑜𝑙 𝐹𝑒2 𝑂3 𝑥
1 𝑚𝑜𝑙 𝐴𝑙 𝑥
1 "𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑠"
= 0.7 𝑚𝑜𝑙 𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑠
1 𝐹𝑒2 𝑂3
1 "𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑠"
= 0.5 𝑚𝑜𝑙 𝑝𝑟𝑜𝑑𝑢𝑐𝑡𝑠
2 𝐴𝑙
Thus alumimum (Al) is our limiting reagent.
1 𝑚𝑜𝑙 𝐴𝑙 𝑥
2 𝐹𝑒
55.8 𝑔 𝐹𝑒
= 1 𝑚𝑜𝑙 𝐹𝑒 𝑥
= 55.8 𝑔 𝐹𝑒 (𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑌𝑖𝑒𝑙𝑑)
2 𝐴𝑙
1 𝑚𝑜𝑙 𝐹𝑒
% 𝑌𝑖𝑒𝑙𝑑 =
41 𝑔
𝑥 100% = 73.4% 𝑦𝑖𝑒𝑙𝑑
55.8 𝑔
Related documents
Link to this page
Permanent link
Use the permanent link to the download page to share your document on Facebook, Twitter, LinkedIn, or directly with a contact by e-Mail, Messenger, Whatsapp, Line..
Short link
Use the short link to share your document on Twitter or by text message (SMS)
HTML Code
Copy the following HTML code to share your document on a Website or Blog
QR Code
