1. HMWK: Work on HP due this Friday!!!
Get out notes from yesterday.. We did not finish last section. And a note sheet for today…no we are not doing this all today!
HMWK: Work on HP due this Friday!!!
Quiz tomorrow on Unit 8 conversions.

2. More Conversions and Two step Conversions STP problems
UNIT 8 Day 2
More Conversions and Two step
Conversions
STP problems

3. Mole/Gram Conversions
25 g NaCl = _________ moles
moles of MgCO3 = _______ grams
moles MgCl2 = _____________ grams
Bell Work - 4/27

4. Mole/Gram Conversions
25 g NaCl = _________ moles
0.43 mol
moles of MgCO3 = _______ grams
269.8 g
moles MgCl2 = _____________ grams
31.42 g
Bell Work - 4/27

5. Mole/Volume Conversions
Avogadro’s Hypothesis: equal volumes of gases at the same temperature and pressure contain equal numbers of particles.
At STP, 1 mole of any gas occupies a volume of L.
Ex moles CH4 x 22.4 L = L CH4
1 mol

6. Mole Ratios
The mole ratio is indicated by the coefficients in the balanced equation.
2Mg + O2 → 2MgO
How many moles of each substance?
2 moles Mg
1 mole O2
2 moles of MgO

7. Mole Ratio N2 + 3 H2 → 2 NH3 Balance the equation
What is the mole ratio of nitrogen gas to ammonia?
1: 3 : 2
If 2 moles of Nitrogen react with an excess of hydrogen, how many moles of NH3 will be produced?
4 moles of NH3

8. Mole Ratio N2 + H2 → NH3 Balance the equation
What is the mole ratio of nitrogen gas to ammonia?
If 2 moles of Nitrogen react with an excess of hydrogen, how many moles of NH3 will be produced?

9. Mole Ratio
How many moles of KClO3 must decompose in order to produce 9 moles of oxygen gas?
2KClO3 → 3O2 + 2KCl
Ratio = 2:3:2
2 x 3 = 6 moles

10. TODAY…. 1. Review of Chalk Lab 2
TODAY…. 1. Review of Chalk Lab 2. Quiz on Molar Mass and molar conversions. 3. Stoichiometry Video 4. Two step conversion notes
HMWK:
HP part 5 due tomorrow- yellow sheet and “Share” with me your Googledoc or bring in your showboard for me to look at

11. 2 step conversion problems
Determine the mass of lithium hydroxide produced when 0.38 g of lithium nitride reacts with water according to the following equation:
Li3N + 3H2O → NH3 + 3LiOH
Step 1: Determine given and unknown.
Given: mass of Li3N = 0.38 g Unknown: Mass of LiOH
Step 2: Start with givens, and add conversions to get to unknown.
Step 3: Solve by canceling out units and multiplying/dividing

12. 2 step conversion cont.
Determine the mass of lithium hydroxide produced when 0.38 g of lithium nitride reacts with water according to the following equation: Li3N + 3H2O → NH3 + 3LiOH
0.38 g Li3N x 1 mol Li3N x 3 mol LiOH x g LiOH = 0.78g
34.83 gLi3N 1 mol Li3N mol LiOH LiOH

13. 2 step conversion Practice
Find the mass of sugar (C6H12O6) required to produce 1.82 L of Carbon Dioxide gas at STP from the reaction described by the following equation:
C6H12O6 → 2C2H6O + 2CO2
Start with what you know…
You got to get from 1.82 L CO2 to grams of sugar.
You will need to find the
Molar mass of sugar
= g
Molar mass of Carbon Dioxide
= g

14. 2 step conversion Practice
Find the mass of sugar (C6H12O6) required to produce 1.82 L of Carbon Dioxide gas at STP from the reaction described by the following equation:
C6H12O6 → 2C2H6O + 2CO2
Now.. Set up conversions to get what you want on the top of the equation…
L Carbon Dioxide X mole CO2 X mole Sugar X g sugar =
_____________ ________ _________ _______
1 L CO mole CO2 mole sugar

15. 2 step conversion Practice
Find the mass of sugar (C6H12O6) required to produce 1.82 L of Carbon Dioxide gas at STP from the reaction described by the following equation:
C6H12O6 → 2C2H6O + 2CO2
Now.. Set up conversions to get what you want on the top of the equation…
1.82 L CO2 X 1 m CO2 X m C6H12O6 X g C6H12O6 = gC6H12O6
_____________ ________ _________ _______
L CO m CO m sugar

16. 2 step conversion Practice
How many liters of Oxygen at STP are needed to react with 5.2 x 1022 molecules of hydrogen sulfide?
2H2S + 3O2 → 2SO2 + 2H2O
Start with what you know and figure out what you want to know and what units it needs to be in!
Molecules of H2S and you want L of O2 both on top

17. 2 step conversion Practice
How many liters of Oxygen at STP are needed to react with 5.2 x 1022 molecules of hydrogen sulfide?
2H2S + 3O2 → 2SO2 + 2H2O
1.93 L Oxygen

18. How many grams of Aluminum Carbonate are needed to produce 4
How many grams of Aluminum Carbonate are needed to produce 4.5 grams of Aluminum Oxide in the following reaction?
Al2(CO3)3 → Al2O3 + 3CO2
You’ve got to go from Grams Al2 O3 to g Al2 (CO3 )3