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!