Weltee Wolo
Rasmussen Community College
September 2nd 2020
Chemical Composition and Calculations
Instructions: Write out a linear equation to answer each question.
1. How many molecules of oxygen are found in 3.00 moles of oxygen?
1 mol of any particle=6.023×1023 number of particles
1 mol of oxygen= 6.023×1023 molecules of oxygen
3.00 moles of oxygen= (3.00×6.023×1023)molecules of oxygen
Therefore the of molecules found in 3.00 moles of oxygen=1.81×1024 molecules of oxygen
2. How many grams are in 5.87×1021 molecules of sulfur?
Number of mole of sulfur=5.87×1021/6.022×1023 mol
Which results to = 9.7476×10-3
Molar mass of sulfur molecule= 8(32.065)g/mol
Which gives =256.52 g/mol
Mass of sulfur=(number of mole of sulfur molecule)x(molar mass of sulfur molecule)
Hence =(9.7476×10-3 mol) (256.52g/mol)
Which results to =2.5004g
3. How many atoms are found in 5.20 g of magnesium (Mg)?
Molar mass of Magnesium (Mg) =24g
Mole of Magnesium in 4.20g=4.20g/24g mol
Which gives =0.175mol
0.175 mole=(6.023×1023 x 0.175)atoms
Hence answer =1.054×1023
=1023 atoms
4. How many atoms are found in 3.45 g of CO2?
Mass/molar mass= the number of molecules/NA=moles
Molar mass of CO2 =44g/mol Also Given mass of CO2 =3.45g/mol
3.45/44= number of molecules/6.023x 1023
Number of molecules=4.72×1022 molecules. Hence (3 x4.72×1022)
Which gives the answer as =1.42x 1022 atoms
Instructions: Calculate the mass percent composition of a compound. Show all of your work.
5. Calculate the mass percent of 0.485 g of H, which reacts with oxygen to form 2.32 g H2O.
Mass of % H = mass of H/ total mass of sample x100%
Therefore, 0.485×2/ 2.32 x100%
Hence the Mass % of H=41.81%
6. Calculate the mass percent of manganese (Mn) in potassium permanganate (KMnO4).
%Mg = (54.94x1mol/158)x100 -> 0.348×100
Therefore, %Mg = 34.8%
Instructions: Calculate the empirical or molecular formula for compounds. Show all of your work.
7. A 2.87 g sample of carbon reacts with hydrogen to form 3.41 g of car fuel. What is the empirical formula of the car fuel?
Weight of carbon = 2.87 g, Weight of car fuel =3.41 g
Weight of hydrogen =(3.41-2.87)
Which gives =0.54 g
Hence, the % of C =2.87/3.41 = 0.8416 x 100%=84.2%
% of H =100%-84.2% =15.8%
Which results to the formula as= C4H9
8. Glucose is a carbohydrate that contains carbon, hydrogen, and oxygen. The empirical formula of glucose is CH2O, and its molar mass is 180.12 g/mol. Find the molecular formula of glucose.
180.12 divided by 30.027 = 6
Hence the molecular formula= C6H12O6
Chemical Bonding
Instructions: Draw the Lewis Structures for the following molecules. There are free software programs available online that will allow you to draw these structures. You can also use drawing tools on your computer or freehand it, take a picture and insert it into this document.
1. ZnCl2
..
Zn:Cl:
..
2. CH4
H
..
H:C:H
..
H
3. NI3
.. .. ..
:I:N:I:
.. .. ..
:I:
..
4. H2O
..
H:O:H
..
Instructions: Draw the resonance structures for the following compounds.
5. NO3-
.. .. ..
:O-S-O:
.. I ..
:O:
..
Instructions: Give the molecular geometry and the bond angles for the following compounds.
6. H2O
.. ..
O
/
H H
Bent 104.5 degrees
AX2F
7. CCI4
..
:Cl:
.. I ..
:Cl-C-Cl:
.. I ..
:Cl:
..
Tetrahedral
109.5 degrees
AX4N
8. CO2
.. .. ..
O::C::O
.. .. ..
Linear, 180 degrees
AX2X
9. NH3
..
H-N-H
I
H
..
N
/ I
H H H
Trigonal pyramidal
<120 degrees
Instructions: There are various types of covalent bonds. Determine if the following molecules are polar, nonpolar, or ionic compounds.
10. NaCl
Ionic Compound
11. CH4
Nonpolar
12. BH3
Nonpolar
13. H2O
Polar
14. CHCI3
Polar
Naming Acids
Instructions: Provide the name of each of the following acids.
1. HBr- Hydrobromic Acid
2. HF- Hydrofluoric Acid
3. HC2H3O2- Acetic Acid
4. HNO3 Nitric Acid
Instructions: Provide the molecular formula for the following acids.
5. Hydrocyanic acid- HCN
6. Phosphoric acid- H3PO4
References
Umemoto, K., & Hirose, K. (2020). Chemical compositions of the outer core examined by first-principles calculations. Earth and Planetary Science Letters, 531, 116009.
Zhao, L., Pan, S., Holzmann, N., Schwerdtfeger, P., & Frenking, G. (2019). Chemical bonding and bonding models of main-group compounds. Chemical Reviews, 119(14), 8781-8845.
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Wwolo_ModuleThreeAssignment_09022020.docx
Home>Chemistry homework help>Module 03 Assignment
Running head: MODULE THREE ASSIGNMENT 1
MODULE THREE ASSIGNMENT 2
Module Three Assignment
Weltee Wolo
Rasmussen Community College
September 2nd 2020
Chemical Composition and Calculations
Instructions: Write out a linear equation to answer each question.
1. How many molecules of oxygen are found in 3.00 moles of oxygen?
1 mol of any particle=6.023×1023 number of particles
1 mol of oxygen= 6.023×1023 molecules of oxygen
3.00 moles of oxygen= (3.00×6.023×1023)molecules of oxygen
Therefore the of molecules found in 3.00 moles of oxygen=1.81×1024 molecules of oxygen
2. How many grams are in 5.87×1021 molecules of sulfur?
Number of mole of sulfur=5.87×1021/6.022×1023 mol
Which results to = 9.7476×10-3
Molar mass of sulfur molecule= 8(32.065)g/mol
Which gives =256.52 g/mol
Mass of sulfur=(number of mole of sulfur molecule)x(molar mass of sulfur molecule)
Hence =(9.7476×10-3 mol) (256.52g/mol)
Which results to =2.5004g
3. How many atoms are found in 5.20 g of magnesium (Mg)?
Molar mass of Magnesium (Mg) =24g
Mole of Magnesium in 4.20g=4.20g/24g mol
Which gives =0.175mol
0.175 mole=(6.023×1023 x 0.175)atoms
Hence answer =1.054×1023
=1023 atoms
4. How many atoms are found in 3.45 g of CO2?
Mass/molar mass= the number of molecules/NA=moles
Molar mass of CO2 =44g/mol Also Given mass of CO2 =3.45g/mol
3.45/44= number of molecules/6.023x 1023
Number of molecules=4.72×1022 molecules. Hence (3 x4.72×1022)
Which gives the answer as =1.42x 1022 atoms
Instructions: Calculate the mass percent composition of a compound. Show all of your work.
5. Calculate the mass percent of 0.485 g of H, which reacts with oxygen to form 2.32 g H2O.
Mass of % H = mass of H/ total mass of sample x100%
Therefore, 0.485×2/ 2.32 x100%
Hence the Mass % of H=41.81%
6. Calculate the mass percent of manganese (Mn) in potassium permanganate (KMnO4).
%Mg = (54.94x1mol/158)x100 -> 0.348×100
Therefore, %Mg = 34.8%
Instructions: Calculate the empirical or molecular formula for compounds. Show all of your work.
7. A 2.87 g sample of carbon reacts with hydrogen to form 3.41 g of car fuel. What is the empirical formula of the car fuel?
Weight of carbon = 2.87 g, Weight of car fuel =3.41 g
Weight of hydrogen =(3.41-2.87)
Which gives =0.54 g
Hence, the % of C =2.87/3.41 = 0.8416 x 100%=84.2%
% of H =100%-84.2% =15.8%
Which results to the formula as= C4H9
8. Glucose is a carbohydrate that contains carbon, hydrogen, and oxygen. The empirical formula of glucose is CH2O, and its molar mass is 180.12 g/mol. Find the molecular formula of glucose.
180.12 divided by 30.027 = 6
Hence the molecular formula= C6H12O6
Chemical Bonding
Instructions: Draw the Lewis Structures for the following molecules. There are free software programs available online that will allow you to draw these structures. You can also use drawing tools on your computer or freehand it, take a picture and insert it into this document.
1. ZnCl2
..
Zn:Cl:
..
2. CH4
H
..
H:C:H
..
H
3. NI3
.. .. ..
:I:N:I:
.. .. ..
:I:
..
4. H2O
..
H:O:H
..
Instructions: Draw the resonance structures for the following compounds.
5. NO3-
.. .. ..
:O-S-O:
.. I ..
:O:
..
Instructions: Give the molecular geometry and the bond angles for the following compounds.
6. H2O
.. ..
O
/
H H
Bent 104.5 degrees
AX2F
7. CCI4
..
:Cl:
.. I ..
:Cl-C-Cl:
.. I ..
:Cl:
..
Tetrahedral
109.5 degrees
AX4N
8. CO2
.. .. ..
O::C::O
.. .. ..
Linear, 180 degrees
AX2X
9. NH3
..
H-N-H
I
H
..
N
/ I
H H H
Trigonal pyramidal
<120 degrees Instructions: There are various types of covalent bonds. Determine if the following molecules are polar, nonpolar, or ionic compounds. 10. NaCl Ionic Compound 11. CH4 Nonpolar 12. BH3 Nonpolar 13. H2O Polar 14. CHCI3 Polar Naming Acids Instructions: Provide the name of each of the following acids. 1. HBr- Hydrobromic Acid 2. HF- Hydrofluoric Acid 3. HC2H3O2- Acetic Acid 4. HNO3 Nitric Acid Instructions: Provide the molecular formula for the following acids. 5. Hydrocyanic acid- HCN 6. Phosphoric acid- H3PO4 References Umemoto, K., & Hirose, K. (2020). Chemical compositions of the outer core examined by first-principles calculations. Earth and Planetary Science Letters, 531, 116009. Zhao, L., Pan, S., Holzmann, N., Schwerdtfeger, P., & Frenking, G. (2019). Chemical bonding and bonding models of main-group compounds. Chemical Reviews, 119(14), 8781-8845. Applied Sciences Architecture and Design Biology Business & Finance Chemistry Computer Science Geography Geology Education Engineering English Environmental science Spanish Government History Human Resource Management Information Systems Law Literature Mathematics Nursing Physics Political Science Psychology Reading Science Social Science Home Blog Archive Tags Essay Reviews Contact google+twitterfacebook Copyright © 2019 HomeworkMarket.com
