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Stoichiometry Time!
Let’s get started!P2 Mrs. Basile’s class
The Problem 21. What mass of
is produced when 82.4g of Rb and 11.6g of
ORb2
2O
The Solution
Which one is balanced?
4RbO2+2Rb2O
4Rb+O22Rb2O
*Ding* Correct! This equation is balanced!
On to the next question…
The Solution Part 2 What is the correct
answer for 82.4g Rb?
ORB221g Rb2O90.11
g
9.0gRb2O
ORB2
The Solution Part III
Which is the correct answer of 11.6g of O2?
123.4g Rb2O135.53g Rb2O
4g O2
*Ding* Correct! 11.6gO2 x
2
2
32
1
gO
molO x
21
22
molO
OmolRbx
OmolRB
OgRb
21
294.186
=32
294.18626.11 OgRbxx= 32
00.4337 = 135.53gRb2O
On to the last part…
The Last Part
So which element is the limiting reactant, everybody?
RbO2
*Ding* Correct Yay! You correctly noticed that
90.11g of Rb2O was smaller than 135.53g of Rb2O. Therefore, Rb is the limiting reactant! Hooray !!!!
*Beep* FAIL! >:(
Really? We’ve gone this far and you can’t see that 135.53g of Rb2O is larger?
Go back, please
*Beep* NO! >:(
This is the wrong answer. Think back to what I told you before. Is it balanced?
No!Back!
*Beep* INCORRECT! >:(
This is the wrong answer! Go back to your notes on the balanced slide, and redo the problem.
Go back!
*Ding* Correct 82.4g Rb x
gRB
molRb
47.85
1
OmolRb
OgRbx
molRb
omolRbx
21
294.186
4
22=
447.85
94.18624.82
x
xx
=88.341
71.30807 = 90.11gRb2O
Good Job! On to next question…
*Beep* WRONG! >:(
The equation is not balanced
Go back, fool!