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- 1. Multiple Choice
It is the standard scientific unit for measuring the amount of substance or large quantities of very small entities e.g. atoms, molecules, or other specified particles.
Mole
Molecule
Atomic Mass
Molar Mass
- 2. Multiple Choice
The molecular formula for a carbon and hydrogen compound is C8H18. What is the empirical formula?
C8H18
C18H8
C9H4
C4H9
- 3. Multiple Choice
Which of the following statements regarding the mole is incorrect?
A mole is a counting unit equal to 6.02 x 1023 particles.
A mole of particles of an element is numerically equal to the atomic mass of the element.
The number of particles in a mole is known as Avogadro’s number.
none of the above
- 4. Multiple Choice
Which of the following compounds is correctly matched with its empirical formula?
dihydrogen dioxide -H2O2
tetrahydrogen dioxide- H4O2
hydrogen dioxide - H2O
dihydrogen dioxide- HO
- 5. Multiple Choice
Acetone, C3H6O, is the main component of fingernail polish remover. What is the molar mass of acetone to the nearest hundredths place?
29.018 g/mol
58.1 g/mol
34.058 g/mol
58.08 g/mol
- 6. Multiple Choice
What is the percent composition of hydrogen in water?
88.8%
66.7%
11.2%
33.3%
- 7. Multiple Choice
It shows the actual number of atoms of each element in a molecule.
Molecular Formula
Empirical Formula
Chemical Formula
Molar Formula
- 8. Multiple Choice
Chalk is mostly made of calcium carbonate, CaCO3. If it took 48.6 g of chalk to write your name on the sidewalk, how many moles of calcium carbonate does your name contain?
0.486 mol
1.40 mol
0.714 mol
2.06 mol
- 9. Multiple Choice
Methyl acetate, is a solvent commonly used in paints, ink, and adhesives, and is often identified by the formula CH₃COOCH₃. What is the empirical formula for methyl acetate?
CH2O
C3H6O2
C6H12O6
C1.5H3O
- 10. Multiple Choice
Ammonium nitrate (NH4NO3), commonly known as ANFO, is a compound used to make explosive devices. How many grams are in one mole of ammonium nitrate to the nearest thousandths place?
31.014 g
48.045 g
45.021 g
80.043 g
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