Mole Worksheet (Key). 1. The average distance between the Earth and Moon is 384,403 km. Using material provided in lab, calculate how many pennies wou...
How many molecules are there in 4.00 moles of glucose, C6H12O6? 3. How many moles are 1.20 x 1025 atoms of phosphorous? 4. How many atoms are in 0.750 moles of zinc? 5. How many molecules are in 0.400 moles of N2O5? Mole- Mass Conversions. 1. How man
It is important to be able to convert units from and into units of moles. The mole is a unit for count, as is the dozen. A dozen is 12 items, but a mole is 602 000 000 000 000 000 000 000 , or 6.02 × 1023 particles. Using the periodic table we can fi
Mole Calculation Practice Worksheet. Answer the following questions: 1). How many moles are in 25.0 grams of water? 2). How many grams are in 4.500 moles of Li2O? 3). How many molecules are in 23.0 moles of oxygen? 4). How many moles are in 3.4 x 10.
Mole Calculation Worksheet. 1). How many moles are in 15 grams of lithium? 2). How many grams are in 2.4 moles of sulfur? 3). How many moles are in 22 grams of argon? 4). How many grams are in 88.1 moles of magnesium? 5). How many moles are in 2.3 gr
Mole to Grams, Grams to Moles Conversions Worksheet. What are the molecular weights of the following compounds? (all masses must be to nearest hundredth). 1). NaOH. 2). H3PO4. 3). H2O. 4). Mn2Se7. 5). MgCl2. 6). (NH4)2SO4. There are three definitions
Mole Calculation Practice Worksheet. Answer the following questions: 1). How many moles are in 25 grams of water? 2). How many grams are in 4.5 moles of Li2O? 3). How many molecules are in 23 moles of oxygen? 4). How many moles are in 3.4 x 1023 mole
*\fºr st It. Jºl !"KEY Mole Conversions Worksheet. There are three mole equalities. They are: 1 mol = 6.022 x 10° particles. 1 mol = molar mass in grams (periodic table – red numbers). 1 mol = 22.4 L for a gas at STP. Mole-Particle Conversions. 1. Ho
Mole Calculation Worksheet. W 340. Everett Community College Tutoring Center. Student Support Services Program. 1). How many moles are in 40.0 grams of water? 2). How many grams are in 3.7 moles of Na2O? 3). How many atoms are in 14 moles of cadmium?
Identify each material as either a mixture or pure substance. ... If the material is a pure substance, identify it as an element or a compound. Material. Mixture ... Homogeneous. 9. Pizza. Mixture. Heterogeneous. 10. Blood. Mixture. Heterogeneous. 11
Virtual Cell Worksheet- ANSWER KEY. 1. Centrioles are only found in animal cells. They function in cell division. They have 9 groups of 3 ... It also produces lipids for the cell. Draw a picture of the smooth ER. Smooth ER. 7. Cell Membrane performs
1 Solutions Molarity Worksheet Name: _____KEY_____ 1. When we dissolve a cube of sugar in one cup of water, we create a homogeneous mixture
Mole to Grams, Grams to Moles Conversions Worksheet. What are the molecular weights of the following compounds? 1). NaOH. 2). H3PO4. 3). H2O. 4). Mn2Se7. 5). MgCl2. 6). (NH4)2SO4. There are three definitions (equalities) of mole. They are: 1 mole = 6
Chemistry*Temperature&SpecificHeat*Worksheet*Answer Key ! ... Specific!Heat!Calculations!! ... Chemistry Temperature and Specific Heat Worksheet Answers.docx Author:
The _____average atomic mass_____of an element is the average mass of an element ’s naturally occurring atom, or isotopes, ... Atomic Structure Worksheet No1 KEY
Directions: Place the images in the correct order from the birth of a star to its death. Briefly describe what stage in the lifecycle of a star is represented in each image. 1. = C - Protostar - A star that has not yet reached the fusion stage. It gr
The number of protons in one atom of an element determines the atom’s ... Atomic Structure Worksheet No1 KEY Author: nerickson Created Date:
KEY. PHYSIO | Joint Review Worksheet | Part One. Directions: Answer the following questions using your notes and or the book. 1. An alternative name for a joint: Articulation. 2. What does the prefix 'arthr' mean? Joint. 3. How is movement within a j
Moles, Molecules, and Grams Worksheet and Key. 1) How many moles are there in 24.0 grams of FeF3? 2) How many moles are there in 458 grams of Na2SO4? 3) How many grams are there in 2.30 x 1024 atoms of silver? 4) How many grams are there in 7.40 mole
Mole Calculations Review Worksheet – answers on next page. 1. Calculate the molar mass of each compound. a. LiOH c. Mg(C2H3O2)2 b. barium bromide d. Ca(NO3)2. 2. How many molecules are in 45.0 grams CH4? 3. How many moles are in 18.8 grams NaOH? 4. A
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Mole Calculations. Chemical Equations and Stoichiometry. Lecture Topics. Atomic weight, Mole, Molecular Mass, Derivation of Formulas, Percent Composition. Chemical Equations and Problems Based on. Miscellaneous Problems, Solution Problems, Review Han
Mole Worksheet (Key) 1. The average distance between the Earth and Moon is 384,403 km. Using material provided in lab, calculate how many pennies would be needed to stack head to tails to span this distance. *I measured 10 pennies to have a height of 1.40cm.
384403km x
1000m 100cm 10 pennies x x = 2.75x1011 pennies km m 1.40cm
2. Determine the mass of a 5.00 cm line drawn with a number 2 pencil. -10 a. Assuming the pencil “lead” is made of carbon atoms (diameter = 1.54 x 10 m), calculate the length of these atoms if they were lined end to end. *Determine the mass of blank piece of paper to be 0.3040 grams. Then drew a line on the paper and determined the mass to be 0.3045 grams. Mass of line = (Paper + line) - (Paper with no line) Mass of line = 0.3045 g - 0.3040g = 0.0005g
0.0005g C x
mole C 6.022x10 23C atoms 1.54x10 -10 m x x = 3.860899251x10 9 m = 4x10 9 m 12.01gC moleC C atom
b. If the atoms are lined end to end will they reach the moon? If so how many times? 3.860899251x10 9 m x
km trips to moon x =10 trips to moon 1000m 384403km
3. Using material provided in lab, determine the mass (to five significant figures) and volume (to three significant figures) of the average popcorn kernel. *I measured the mass of 18 kernals to be 2.351 grams, and the volume of 66 kernals to be 13.0 mL.
a. Calculate the number of popcorn kernels are present in a 1.00 lb bag of popcorn? (2.2046 lb = 1 kg) 1.00 lb x
kg 1000 g 18 kernals x x = 3470 kernals 2.2046 lb kg 2.351g
b. I buy popcorn in bulk. I take a 2.00 liter bag with me to the store and fill it 75.0% full. How many popcorn kernels am I purchasing? (0.750)(2.00L) x
c.
1000mL 66 kernals x =7620 kernals L 13.0mL
2
The surface area of Texas is 696241 km . How many miles high would 1.00 moles of popcorn kernels stack on top of Texas? Assume the stack goes straight up and keeps the shape of Texas. (1 mi = 1.60943 km)
Volume = (height)(surface area) 3
3
3
$ 13.0mL 6.022x10 23 kernals cm 3 ! m $ ! km $ ! mi x x x# & # & # & Volume 66 keranls mole mL "100cm % "1000m % "1.60943km % height = = 2 surface area ! $ mi 696241km 2 x # & "1.60943km %
height =
28452726.6mi 3 =106 mi 268791.4249mi 2
4. At the front of the classroom is a vial containing (NH4)2Fe(SO4)2⋅6H2O. The empty vial prior to containing the solid sample had a mass of 11.3045 grams. Measure the mass of the vial containing the compound and answer the following questions. a. How many compounds are present in this sample? *I measured the mass of the vial with contents to be 14.4770 grams. Mass of compound = (Mass of vial and contents) - (Mass of empty vial) Mass of compound = (14.4770g) -(11.3045g) Mass of compound = 3.1725g
20 H atoms = 9.743x10 22 H atoms (NH 4 )2 Fe(SO4 )2 ⋅6H 2O compounds
d. What is the mass of water in the sample? 3.1725g (NH 4 )2 Fe(SO4 )2 ⋅6H 2O x
mole (NH 4 )2 Fe(SO4 )2 ⋅6H 2O 6 moles H 2O 18.016g H 2O x x 392.17 0g(NH 4 )2 Fe(SO4 )2 ⋅6H 2O mole (NH 4 )2 Fe(SO4 )2 ⋅6H 2O moles H 2O
0.874453833g H 2O 0.8745g H 2O
e. How many water molecules are in the sample? 0.874453833g H 2O x
moles H 2O 6.022x10 23 H 2O molecules x = 2.923x10 22 H 2O molecules 18.016 gH 2O moles H 2O
f.
How many hydrogen atoms in this compound are part of water molecules?
0.874453833g H 2O x
moles H 2O 6.022x10 23 H 2O molecules 2H atoms x x = 5.846x10 22 H atoms 18.016 gH 2O moles H 2O H 2O molecules
5. Pour approximately 50 mL of water into a 100 mL beaker. Place the beaker on the analytical balance and record the initial mass. Allow the beaker to sit on the balance for two minutes and then record the final mass. Calculate the number of water molecules which evaporated in those two minutes. *I measured the intial mass to be 186.7327 grams. After two minutes the mass was 186.7259 grams. Mass of water that evaporated = 186.7327 grams - 186.7259 grams = 0.0068 grams
0.0068g H 2Ox
mole H 2O 6.022x10 23 H 2O molecules x = 2.3x10 20 H 2O molecules 18.016g H 2O mole H 2O
6. A sample of sodium metal is determined to have a mass of 5.43 grams. How many moles of sodium are in this sample? 5.43g NaCl x
mole NaCl = 0.236 mole NaCl 22.99g NaCl
7. What is the molar mass of C2H6? Molar Mass = 2(12.01g) + 6(1.008g) Molar Mass = 24.02g + 6.048g Molar Mass = 30.068g Molar Mass = 30.07g
8. What is the mass of 0.1346 moles of C2H6? 0.1346 moles C 2 H6 x
30.068g C 2 H6 = 4.047 g C 2 H 6 moles C 2 H6
9. A balloon contains 4.29 grams of oxygen. How many oxygen molecules are present in the balloon? 4.29g O 2 x
mole O 2 6.022x10 23 molecules O 2 x = 8.07x10 22 molecules O 2 32.00g O 2 mole O 2
10. How many oxygen atoms are present in the balloon described in the previous problem? 4.29g O 2 x
mole O 2 6.022x10 23 molecules O 2 2 atoms O x x = 1.61x10 23 atoms O 32.00g O 2 mole O 2 molecule O 2
11. What is the mass of the average helium atom? Answer in grams. 4.003 g He mole He x = 6.647x10 -24 g He/atom He mole He 6.022x10 23 He atoms
12. How many aluminum atoms are there in a 5.430g sample of aluminum oxide? 5.430g Al 2O3 x
mole Al 2O3 2 moleAl 6.022x10 23 Al atoms x x 101.96g Al 2O3 mole Al 2O3 mole Al
6.414174186x10 22 Al atoms 6.414x10 22 Al atoms
13. What mass of aluminum bromide has the same number of aluminum atoms as 5.430g of aluminum oxide? 6.414174186x10 22 Al atoms x
1AlBr3 compounds mole AlBr3 266.68g AlBr3 x x = 28.40g AlBr3 1Al atom 6.022x10 23 AlBr3 compounds mole AlBr3
14. In lab you will be reacting a strip of magnesium with oxygen from the air to form magnesium oxide. If the mass of magnesium used is 0.0357 grams, how many magnesium atoms are being used in this reaction? 0.0357g Mg x
15. What mass of oxygen is needed to react completely with all the magnesium from the previous problem? Hint: what is the ratio of magnesium atoms to oxygen atoms in magnesium oxide? mole Mg mole O 16.00g O 0.0357g Mg x x x = 0.0235g O 24.31g Mg
mole Mg
mole O
16. What mass of chlorine contains 1.396 x 10 1.396x10 21Cl atoms x
17. How many electrons are there in 2.45 grams of calcium? 2.45g Ca x
mole Ca 6.022x10 23Ca atoms 20 electrons x x = 7.36x10 23electrons 40.08g Ca mole Ca Ca atom
18. The distance (based on a direct path) between San Francisco and Los Angeles is 558.68 km. -10 Calculate how many iodine atoms (diameter = 2.66 x 10 m) would be needed to stack end to end to span this distance. 558.68km x
1000m I atom x = 2.10x1015I atoms km 2.66x10 -10 m
19. A compound is composed of lead and oxygen. The mass of a sample of this compound is 1.0245g. The sample contains 0.8874 grams of lead. a. How much oxygen is in this sample? Mass of oxygen = Sample Mass - Mass of lead Mass of oxygen = 1.0245g - 0.8874g Mass of oxygen = 0.1371g
b. How many moles of oxygen atoms are in this sample? 0.1371g O x
mole O = 8.569x10 -3 moles O 16.00g O
c.
How many moles of lead atoms are in this sample? 0.8874g Pb x
mole Pb = 4.283x10 -3 moles Pb 207.2g Pb
d. What is the chemical formula of this sample? O/Pb Molar Ratio =
8.569x10 -3 = 2.000, there are 2 oxygen atoms for every 1 lead atom, (PbO 2 ) 4.283x10 -3
e. What is the chemical name of this sample? Lead (IV) oxide
