Quiz- Moles II

When using moles to determine the amount of a substance you are determining the ______ of atoms.

• mass

• volume

• number

• size

Which of the following best explains why moles of different elements weigh differently

• There are more atoms of some elements.

• The atoms of different elements have different masses

• The atoms of different elements are different sizes

• The atoms have a different number of electrons.

Which of the following has the least mass?

• 1 mol O

• 1 mol N

• 1 mol S

• None

Which of the following has the least atoms?

• 10 g of N

• 10 g of O

• 10 g of S

• None

If samples of two different elements each represent one mole, then

• they have the same atomic mass.

• their molar masses are equal.

• they contain the same number of atoms.

• they are equal in mass.

A mole is equal to _________ particles.

a. b. c. d.

• 6.02 x 10²³

• 6.02

• 12

• 6.02 x 10²²

Avogadro’s number is equal to ___________.

• the mass of a mole

• the number of particles in a mole

• the volume of a mole

• None

Determine how many lentils are in the jar using the following data a student collected.

Mass of 100 lentils: 1.92 g

Mass of empty jar: 131.56 g

Mass of jar w/lentils: 200.87 g

• 36

• 9822

• 3610

• 100

• 9994

Which of the following could represent the molecular weight of a substance?

• 121 g

• 32 mol

• 87 amu

• none

Which of the following is the percent composition of sodium in sodium chloride?

• 50%

• 39.3%

• 60.7%

• 23.7%