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WorksheetsScience 9 - Mole Concept
Total questions: 20
Worksheet time: 10mins
1. It refers to a specific number of particles?
atom
mole
ion
isotope
2. It simply refers to the sum of the masses of the atoms in the molecule of the substance.
atomic mass
formula mass
molecular mass
molar mass
3. The mass in grams of one mole of a substance is called ______________.
atomic mass
formula mass
molecular mass
molar mass
4.Selenium has a 34 protons and 45 neutrons. What is its atomic mass?
68 amu
79 amu
68 g/mol
79 g/mol
5. Avogadro's number is equivalent to _______________________.
6.02 X 1023 particles
6.02 X 1022 particles
6.02 X 1021 particles
6.02 X 1020 particles
6. Solve for the atomic mass of Carbon dioxide (CO2).
Carbon = 12.01 amu
Oxygen = 16.00 amu
38.01 amu
44.01 amu
40.02 amu
56.02 amu
7. One amu is equivalent to 12 grams of _____________ isotope.
Carbon-10
Carbon-11
Carbon-12
Carbon-13
8. Formula mass is appropriate to use for ________________.
metallic compound
ionic compound
covalent compound
isotope compound
9. What unit should be used for molar mass?
amu
grams
g/mol
atoms
10. What is the molar mass of water (H2O)?
Hydrogen = 1.01
Oxygen = 16.00
18.02 amu
33.01 amu
18.02 g/mol
33.01 g/mol
11. What is the molar mass of Potasium Hydroxide (KHO)?
Potassium = 39.10
Hydrogen = 1.01
Oxygen = 16.00
56.11 g/mol
112.22 g/mol
56.11 amu
112.22 amu
12. What is the formula mass of Ca3(PO4)2?
Calcium = 40.08
Phosphorous = 30.10
Oxygen = 16.00
86.18 amu
214.34 amu
278.34 amu
308.44 amu
13. How many grams of silver is present in one mole?
Silver = 107.87
107.87 amu
107.87 grams
215.74 amu
215.74 grams
14. What is the atomic mass of an atom that contains 21 protons, 21 electrons, and 24 neutrons?
21 amu
42 amu
45 amu
66 amu
15. What is the molar mass of Propane (C3H2)?
Carbon = 12.01
Hydrogen = 1.01
13.03 amu
13.03 g/mol
38.05 amu
38.05 g/mol
16. What kind of particles is present in water?
atoms
molecules
ions
isotopes
17. Identify the kind of particles present in Helium (He)?
atoms
molecules
ions
isotopes
18. How many moles are there in 15 grams of Beryllium. (molar mass of Beryllium is 9.01 g/mol)
135.15 moles
24.01 moles
1.66 moles
0.60 moles
19. The amount of matter can be expressed in the following ways except ___________.
moles
mass in grams
volume in cubic
number of particles
20. What is the molar mass of barium nitrate, Ba(NO3)2?
Barium = 137.33
Nitrogen = 14.01
Oxygen = 16.00
261.35 g/mol
213.35 g/mol
199.34 g/mol
167.34 g/mol
