How Much Chromium Is Present in the Alloy?

  • Thread starter Thread starter grumpyasian
  • Start date Start date
  • Tags Tags
    Chemistry
AI Thread Summary
The discussion focuses on determining the percentage of chromium (Cr) in a 5.00g alloy sample that is converted into a K2Cr2O7 solution. The Cr2O7^-2 ions are reduced to Cr^+3 by reacting with 4.73g of iodine (I2), necessitating the balancing of the redox reaction. Once the reaction is balanced, the mass of chromium can be calculated using stoichiometry based on the known mass of iodine used. The key equation involves the conversion of Cr2O7^-2 to Cr^+3, which is essential for finding the percentage of chromium in the alloy. This process highlights the importance of balancing chemical reactions in stoichiometric calculations.
grumpyasian
Messages
7
Reaction score
0

Homework Statement


An alloy sample weighing 5.00g contains Cr. The Cr is chemically converted to a K2Cr2O7 solution. The Cr2O7^-2 ion in the solution is converted to Cr^+3 by reacting it with 4.73g of I2.

Cr2O7^-2 + I2 --->Cr^+3 +IO3 ( need to balance redox reaction)

Homework Equations



What is the % Cr in the alloy?

The Attempt at a Solution

 
Physics news on Phys.org
Once you balance the reaction it is a simple stoichiometry - just calculate mass of Cr in dichromate from known mass of iodine.

--
 
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
Back
Top