WorksheetsMole Concept
Total questions: 20
Worksheet time: 9mins
The following are representative particles of matter. Which among them represents the covalent bond?
a. atom
b. ion
c. molecule
d. particle unit
2. How can knowledge about mole be useful for environmentalists?
a. Mole concept can be used in environmental monitoring.
b. It gives information on the most dangerous pollutant in the atmosphere.
c. It gives a feedback on the kinds of pollutants present in the atmosphere.
d. Mole concept can be used in quantifying the amount of pollutant articles released in the atmosphere.
3. Which of the following units is used in expressing the amount of substance in terms of the number of particles?
a. Liter
b. Gram
c. Mole
d. Celcius
4. Given the atomic masses of Sulfur (32g) and Oxygen (16g), what is the molar mass of sulfate (SO4)?
a. 93 g/mol
b. 96 g/mol
c. 98 g/mol
d. 97 g/mol
5. What do you expect to observe in a “Mole Exhibit of Different Substances?”
a. Different kinds of element
b. Different colors of substances
c. Showcase of one mole of an element of different masses
d. Showcase of different substances having the same mass
6. How many grams are there in 1.2 moles of carbon monoxide
a. 33.0g
b. 33.6g
c. 43.2g
d. 40.0g
7. What is the representative particle of ionic compound?
a. Atom
b. Ion
c. molecule
d. formula unit
8. The molar mass of sulfuric acid is approximately:
a. 90g/mol
b. 98 g/mol
c. 96 g/mol
d. 90 g/mol
9. How many molecules of Ca are present in 100 g of CaCO3? (Ca=40g)
a. 1.1 molecules
b. 1.0 molecules
c. 1.3 molecules
d. 1.5 molecules
10. The mathematical value of Avogadro’s number is _______.
a. 6.02x10
b. 6.2 x 10
c. 6.3 x 1023
d. 6.4 x 1023
11. Molar mass is a numerical value that represents ________.
a. the mass of a substance divided by the amount of that substance
b. the mass of a substance
c. the amount of a substance
d. the number of atoms in a molecule
12. The molar mass of CO2 is :
a. 43 g/mol
b. 44 g/mol
c. 40 g/mol
d. 42 g/mol
13. The atomic weight of Hydrogen is 1.0079 amu and the atomic weight of Oxygen is 15.999 amu. Using the information, what is the molecular weight of hydrogen peroxide (H2O2)?
a. 34 amu
b. 30 amu
c. 32 amu
d. 33 amu
14. Why is mole concept important?
a. It is useful when converting between grams and atoms or molecules.
b. It gives us a convenient way to express large numbers
c. It can be applied to any type of particle representative
d. All of the above
15. Arrange the following substances from the lightest to the heaviest: NH4; CH4; NO3; Cl2; CO3
a. NO3<NH4<CO3<CH4
b. CH4<NH4<CO3<NO3
c. NH4<CO3<NO3<CH4
d. CO3<NH4<NO3<CH4
16. Arrange the following substances from the heaviest to the lightest : CH4; NO3; NH4; CO3
a. CH4>NO3>NH4>CO3
b. CH4>NO3>CO3>NH4
c. NO3>CO3>NH4>CH4
d. CH4>CO3>NH4>NO3
17. Vitamin C, also known as ascorbic acid, is water soluble and cannot be produced by the human body. Each day, a person’s diet should include a source of Vitamin C, such as orange juice. Ascorbic acid has a molecular formula of C6H8O6 and a molar mass of 176 grams per mole. Determine the number of moles of vitamin C in an orange that contains 0.171 grams of vitamin C.
a. 30.1 moles
b. 1030 moles
c. 0.000971 moles
d. 0.0001 mole
18. Butane (CH4CH3CH3CH4) gas is commonly used for portable stoves. What is its molar mass?
a. 65 g/mol
b. 62 g/mol
c. 64 g/mol
d. 61 g/mol
19. Calcium carbonate (CaCO3 Molar Mass = 100g/mole) is an antacid used to neutralize extra acid in the stomach. Jose is prescribed by the doctor to take 250 mg-tablet of CaCO3 three times a day. How many moles of CaCO3 will Jose consume for 3 days?
a. 0.0252 moles
b. 0.0225 moles
c. 0.0242 moles
d. 0.0235 moles
20. Which of the following would have the highest number of moles?
a. 4g Cl2
b. 15g H2O
c. 22g NaCl
d. 100g AgCl
