1. STOICHIMETRY Limiting Reagents
AMY MARKS

2. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + HCL -> MgCl2 + H2

3. First step?
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + HCL -> MgCl2 + H2
Balance Equation
Call Mr. Kirk
End it all now

4. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
CORRECT!
The balanced equation is now Mg + 2HCl -> MgCl2 + H2

5. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
You’re getting there…What to do now?
Find the STP
Convert grams to moles
Put given over 1

6. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
50.0g Mg 1 ? x
24.3g Mg
1 mol Mg
1 mol Mg
24.3g Mg
6.02x10^23
1 mol Mg

7. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
50.0g Mg 1
1 mol Mg
24.3g Mg ? x x
1 mol H2
1 mol Mg
1 mol Mg
22.4 L
1 mol Mg
1 mol H2

8. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
50.0g Mg 1
1 mol Mg
24.3g mg
1 mol H2
1 mol Mg x x x ?
1 mol H2
22.4 L
Just stop 
22.4 L
1 mol H2

9. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
50.0g Mg x mol Mg x mol H2 x L
g Mg mol Mg mol H2
= ?
46.1 L H2
4.61 L H2
461 L H2

10. You’re not done..
Continue on to 2nd half of the problem.

11. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
75g HCl
1 mol 1
75g HCl
What is the first step?
75g HCl 1

12. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
75g HCl 1
x ?
1 mol Mg
1 mol HCl
1 mol HCl
36.5g HCl
36.5g HCl
1 mol HCl

13. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
75g HCl x 1 mol HCl x ?
g HCl
2 mol HCl
__________
1 mol H2
1 mol H2
__________ 1
1 mol H2
__________
2 mol HCl

14. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
75g HCl x mol HCl x mol H2 x ?
g HCl mol HCl
Click me
1 mol H2
22.4 L
22.4 L
1 mol H2

15. What volume of hydrogen at STP is produced from the reaction of 50
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
75g HCl x mol HCl x mol H2 x L H = ?
g HCl mol HCl mol H2
23.0 L H2
23 L H2

16. YEAHHHH BUDDY you’re almost done. Close enough. Let’s go.
What is the excess reagent of the equation?

17. Which do you pick?
fail
50.0g
75g
23 L

18. EXCESS REAGENT cool, you got it.
Mg + 2HCl -> MgCl2 + H2
23 L H2 x ? 1
1 mol H2
22.4 L H2
22.4 L H2
1 mol H2
Who cares.

19. Excess Reagent Cont.. Mg + 2HCl -> MgCl2 + H2 23L H2 x 1 mol H2 x ?
____
2 mol
1 mol H2
____
1 mol Mg
1 mol Mg
____
1 mol H2

20. WOOO. Got it right… Mg + 2HCl -> MgCl2 + H2
23L H2 x 1 mol H2 x 1 mol Mg x ?
L H mol H2
24.3 g
1 mol Mg
1 mol Mg
24.3 g
2 mol Mg
44.6 g

21. Almost finished! Excess Reagent cont..
Mg + 2HCl -> MgCl2 + H2
23L H2 x 1 mol H2 x 1 mol Mg x Mg = ?
L H mol H mol Mg
24 g
25 g
25.0 g

22. In order to find the excess reagent you must now subtract the previous total from the amount that was not the limited reagent.
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl according to the following equation?
Mg + 2HCl -> MgCl2 + H2
Limited reagent : HCl
Previous total : 25g
Non limited : Mg
75-25=50
= 25.0

23. FINALLY DONE
The excess reagent is 25.0

24. How Depressing..

25. So close 

26. YEAHHH..no.

27. Sorry, but..no.

28. U mad?
Back to start. 
Stay mad.