Lecture 12.2b- Gram-Gram Stoich
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Transcript of Lecture 12.2b- Gram-Gram Stoich
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1. A sample of NaCl has a mass of 150g. How many moles does the sample contain?
2. What is the mass of 5.3 moles of water?
5.3 mol x mol
181
g
Bellwork- mole gram conversions
150g NaCl x
gmol 1
58.44= 2.57 moles NaCl
= 95.4 grams
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STOICHIOMETRY
You must be able to
1.Balance equations
2.Convert between moles and grams
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For Stoichiometry–
1.You ALWAYS use moles!! If you are not given moles you must convert to moles.
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For Stoichiometry–
1.You ALWAYS use moles!! If you are not given moles you must convert to moles.
2.Use the mole ratio to convert between compounds.
![Page 5: Lecture 12.2b- Gram-Gram Stoich](https://reader035.fdocuments.in/reader035/viewer/2022081420/558ba9dcd8b42a3d568b45d3/html5/thumbnails/5.jpg)
Most stoichiometry problems involve masses.
![Page 6: Lecture 12.2b- Gram-Gram Stoich](https://reader035.fdocuments.in/reader035/viewer/2022081420/558ba9dcd8b42a3d568b45d3/html5/thumbnails/6.jpg)
Most stoichiometry problems involve masses.
1.Convert grams to moles using the molar mass of the given compound.
![Page 7: Lecture 12.2b- Gram-Gram Stoich](https://reader035.fdocuments.in/reader035/viewer/2022081420/558ba9dcd8b42a3d568b45d3/html5/thumbnails/7.jpg)
Most stoichiometry problems involve masses.
1.Convert grams to moles using the molar mass of the given compound.
2.Convert moles of the given compound to moles of the wanted compound using a mole ratio.
![Page 8: Lecture 12.2b- Gram-Gram Stoich](https://reader035.fdocuments.in/reader035/viewer/2022081420/558ba9dcd8b42a3d568b45d3/html5/thumbnails/8.jpg)
Most stoichiometry problems involve masses.
1.Convert grams to moles using the molar mass of the given compound.
2.Convert moles of the given compound to moles of the wanted compound using a mole ratio.
3.Convert moles to grams using the molar mass of the new compound.
![Page 9: Lecture 12.2b- Gram-Gram Stoich](https://reader035.fdocuments.in/reader035/viewer/2022081420/558ba9dcd8b42a3d568b45d3/html5/thumbnails/9.jpg)
12.3
Step 1- CONVERT TO MOLES!!
5.4g H2 x ______ = 2.7mol H21 mole2.0g
Step 2- Use a mole ratio to convert to moles of another compound.
2.7mol H2 x mol H2
mol NH3
32
= 1.8 mol NH3
![Page 10: Lecture 12.2b- Gram-Gram Stoich](https://reader035.fdocuments.in/reader035/viewer/2022081420/558ba9dcd8b42a3d568b45d3/html5/thumbnails/10.jpg)
Step 1- CONVERT TO MOLES!!
5.4g H2 x ______ = 2.7mol H21 mole2.0g
Step 2- Use a mole ratio to convert to moles of another compound.
2.7mol H2 x mol H2
mol NH3
32
= 1.8 mol NH3
Step 3- Convert moles to grams
1.8 mol NH3 x 1 mole NH3
17g = 31g NH3
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Problem-Solving Approach
Given(G) Wanted(W)
Divide to get moles
Use mole ratio multiply to
get g or L
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N2(g) + 3H2(g) 2NH3(g)
2. What volume of H2 is required to react with 3.0 L of N2, and what volume of NH3 is produced at STP?
a. volume of H2 = 9.0 L, volume of NH3 = 6.0 L
b. volume of H2 = 3.0 L, volume of NH3 = 3.0 L
c. volume of H2 = 3.0 L, volume of NH3 = 6.0 L
d. volume of H2 = 1.0 L, volume of NH3 = 1.5 L
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3. Automotive airbags inflate when sodium azide, NaN3, rapidly decomposes to its component elements via this reaction:
2NaN3 2Na + 3N2.
How many grams of sodium azide are required to form 5.00 g of nitrogen gas?
a. 11.61 g
b. 17.41 g
c. 7.74 g
d. 1.36 g