Molar mass - Study guides, Class notes & Summaries
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Molar Masses assignment and quiz exam with 100% Correct answers already graded A+
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A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder? 
 
4.01 × 10^22 molecules 
6.02 × 10^23 molecules 
9.03 × 10^24 molecules 
2.89 × 10^26 molecules 
9.03 × 10^24 molecules 
 
 
 
A sample of sugar (C12H22O11) contains 
1.505 × 1023 molecules of sugar. How many moles of sugar are present in the sample? Answer without doing any calculations. 
 
0.25 mol 
0.50 mol 
1.00 mol 
2.50 mol 
0.25 mol 
 
 
 
Use the periodic table to determ...
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Molar Mass exam with 100% Correct answers already graded A+
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Find the molar mass of glucose? (C6 H12 O6) 
6X12.01=72.06 
12X1.01=12.12 
6X16=96 
=180.18g 
 
 
 
Find the molar mass of Al2 (SO4)3 
2X26.98=53.96 
3X32.07=96.21 
12X16=192 
= 342.17g 
 
 
 
Find the molar mass of Ba (NO3)2 
1X137.33=137.33 
2X14.01=28.02 
6X16=96 
= 261.35g 
 
 
 
Find the percentage of Oxygen in KClO3 
1X39.10=39.10 48/122.55X100 
1X35.45=35.45 
3X16=48 =39.2% 
Molar mass= 122.55g 
 
 
 
Find the percentage of water in MgCl2 X 6H20 
1X24.31=24.31 108.12/203.33X100 
2X35.45=7...
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Chapter 7 Moles and Molar Mass exam with 100% Correct answers already graded A+
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Avogadro's Number 
in honor of Amadeo Avogadro 
() 
 
 
 
The mole (mol) 
The unit for counting atoms. 
 
The mole is a unit for counting just as a dozen or a ream or a gross is used to count. 
 
 
 
Atomic mass for an element 
The average relative mass of all the isotopes for the element. 
 
 
 
1 mole atoms = 
 
 
 
1 mole molecules = 
 
 
 
The atomic mass of an element in grams contains (2) 
The atomic mass of an element in grams contains... 
 
(1) Avogadro's number of atoms (2) and is def...
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Chemistry Test Molar Mass exam with 100% Correct answers already graded A+
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Define: Avogadro's number 
6.023x 10^23 
One mole of a pure substance 
 
 
 
Define: Empirical Formula 
elements combined in a compound with subscripts showing the smallest whole-number mole ratio 
 
 
 
Define: Molecular formula 
a formula showing the types and numbers of atoms combined in a single molecule of a molecular compound 
 
 
 
Define: Formula mass 
the sum of the average atomic masses of all the atoms represented in the formula of any molecule, formula unit, or ion 
 
 
 
Define: Mo...
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CHEM120 Week 8: Exam 3 (Units 5, 6, and 7) – With 100% Correct Answers- Download To Score An A+
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CHEM120 Week 8: Exam 3 (Units 5, 6, and 7) – With 100% Correct Answers- Download To Score An A+ 1. Question: (TCO 7) (a, 5 pts) Given that the molar mass of H3PO4 is 97.994 grams, determine t he number of grams of H3PO4 needed to prepare 0.25L of a 0.2M H3PO4 solution. Show your work. (b, 5 pts) What volume, in Liters, of a 0.2 M H3PO4 solution can be prepared by diluting 50 mL of a 5M H3PO4 solution? Show your work. (Pts. : 10) A. Molarity = moles of solute/liters of solution moles of solute ...
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Molar masses PRACTICE TEST WITH VERIFIED SOLUTIONS.
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How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen? 
1 mol of oxygen has fewer molecules. 
 
1 mol of oxygen has more molecules. 
 
Each sample has the same number of molecules. 
 
The molecules cannot be compared without knowing the mass. 
Each sample has the same number of molecules 
 
 
What is the molar mass of CHCl3? 
48.47 g/mol 
 
83.92 g/mol 
 
119.37 g/mol 
 
121.39 g/mol 
119.37 g/mol 
 
 
Which is the formula mass of (NH4)2SO4...
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CHEM 101L Lab 4: Molar Mass FALL 2023 (Straighterline)
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Avogadro’s number: 
Select one: 
a. Equals 6.02 × 10 molecules/mole. 
b. Is used to determine the number of atoms or molecules in a substance. 
c. Equals the number of atoms in 12 gram of C. 
d. All of the above. 
Calculate the molecular mass of calcium chloride (CaCl ). 
Select one: 
a. 35.45 g/mol 
b. 110.98 g/mol 
c. 40.08 g/mol 
d. 75.53 g/mol 
True or false: Avogadro’s number is named after the nineteenth century Italian 
scientist Amedeo Avogadro 
Select one: 
a. True 
b. False
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Chemistry: 3.4 - Molar Mass exam with 100% Correct answers already graded A+
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molar mass 
the volume of one mole of an ideal gas; equal to 22.42 liters at STP 
 
 
Standard temperature and pressure (STP) the condition 0℃ 
and 1 atmosphere of pressure 
 
 
 
molecular weight 
 
 
 
formula unit 
 
 
 
Ultimately, what is a chemical compound 
A chemical compound is, ultimately, a collection of atoms. 
 
 
 
example of chemical compound, ultimately, being a collection of atoms. 
For example, methane (the major component of natural gas) consists of molecules that each conta...
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MOLAR MASS CK12 exam with 100% Correct answers already graded A+
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The molar mass of iron is _____. 
55.8 g/mol 
 
 
 
Oil of vitriol is a substance that humankind has known of for thousands of years! Today the substance is known by it's scientific name sulfuric acid and has the molecular formula H2SO4. 
What is the molar mass of H2SO4? 
98.08 g/mol 
 
 
 
Calculate the molar mass of iron oxide (Fe2O3). 
159.7 g/mol 
 
 
 
How many moles are there in 45.0 grams of sulfuric acid, H2SO4? 
0.46 moles 
 
 
 
Calculate the molar mass of sodium bicarbonate, NaHCO3. ...
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Mole and Molar Mass exam with 100% Correct answers already graded A+
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Avogadro's Number 
The number of atoms in 12.01 grams of Carbon 
 
 
 
Numerical Value of Avogadro's Number 
6.02 × 10²³ parts 
 
 
 
Parts= Representative Particles 
1) Atoms 
2) Ions 
3) Formula Units 
4) Molecules 
 
 
 
Mole 
The SI unit of measure for an amount of a chemical substance 
 
 
 
Molar Mass 
The mass in grams of one mole of a substance 
 
 
 
What is the molar mass of Mg(NO₃)₂? 
148.33g/mol 
 
 
 
What is the mass of 1.33 moles of Titanium, Ti? 
63.7gTi 
 
 
 
What are ...
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