MASS MOLES AND PARTICLES

True or False

100

One mole of any substance contains the same number of particles.

True

200

Avogadro’s number is 6.02×10²³

True

300

The molar mass of oxygen gas (O₂) is 16

False – It’s 32 g/mol.

400

The mole ratio is always based on the number of atoms, not molecules.

False – It can be based on either depending on the question.

500

The mass of one atom of carbon is 12 g.

False – That’s 12 atomic mass units (u), not grams.

MCQ

100

he molar mass of H₂O is:
 A) 16 g/mol
 B) 18 g/mol
 C) 20 g/mol
 D) 2 g/mol

 B) 18 g/mol

200

Which unit is used to express molar mass?
 A) mol
 B) g
 C) g/mol
 D) atoms

C) g/mol

300

Which statement is true?
 A) 1 mol of Na = 23 g
 B) 1 mol of H₂ = 1 g
 C) 1 mol of O₂ = 16 g 

  D) None

A) 1 mol of Na = 23 g

400

Which of the following is equal to one mole?
 A) 12 g of carbon
 B) 6.02 × 10²³ atoms
 C) Both A and B
 D) None

C) Both A and B

500

What is Avogadro’s number used to convert?
 A) Mass to moles
 B) Moles to particles
 C) Moles to volume
 D) Atoms to molecules

 B) Moles to particles

Mole

100

How many moles are in 12.0 g of carbon? (C = 12)

1.00 mole

200

 Calculate the moles of platinum if you have a ring that contains 5.50 x 10²² atoms of platinum.

0.0914 mol

300

Express 2.11 × 10²⁴ molecules of sucrose in moles:

3.50 mol sucrose

400

Titanium (Ti) is a metal that is often used to produce strong, lightweight alloys. If an alloy contains 645 g of titanium, how many moles of titanium are present?

13.7 mol Ti

500

How many moles of CaCO₃ are in 250 g?

2.50 mole

mass and particles

100

Find the mass of 2 mol of H₂. (H₂ = 2 g/mol)

4g

200

..........................is the mass in grams of one mole of any pure substance.

Molar mass

300

Zirconium (Zr) is a metal used in nuclear reactors because it is resistant to corrosion. What is the mass of a sample that contains 4.05 mol of zirconium?

369g Zr

400

............................... is the average mass of the isotopes of an element compared to 1/12th the mass of an atom of carbon-12

Relative Atomic Mass

500

Scandium (Sc) is a metal found in rare minerals that are mined in Scandinavia. If a mineral sample contains 25.6 g of scandium, how many atoms of scandium are in the sample?

3.43 x 10²³ atoms Sc

particles

100

How many particles are in 1 mol of a substance?

6.02×10²³ particles

200

How many molecules in 2 mol of H₂O?

2×6.02×10²³ = 1.204×10²⁴

300

Neon is the unreactive noble gas found in neon lamps. The gas gives off a reddish glow in these lamps. If a neon bulb contains 2.69 x 1022 atoms of neon, what is the mass, in grams, of the neon?

0.902g Ne

400

Find the number of moles of hydrogen atoms in 0.58 mol of H₂O

1.2 mol hydrogen atoms

500

Find the number of moles of phosphate ions PO₄^3-, in 2.50 moles of Ca₃(PO₄)₂. 

5.00 mol PO₄^3-