Mole unit practice test

How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C₃H₇O?

• 5 (6.02 x 10²³)

• 5

• 35

• 55 (6.02 x 10²³)

Which of the following best describes a representative particle?

• atom

• molecule

• cation

• all of the above

• only atom and molecule

Tags

NGSS.MS-PS1-1

Avogadro's number of representative particles is equal to one ____.

• kilogram

• kelvin

• gram

• mole

All of the following are equal to Avogadro's number EXCEPT ____. a. b. c. d.

• the number of atoms of bromine in 1 mol Br₂

• the number of atoms of gold in 1 mol Au

• the number of molecules of nitrogen in 1 mol N₂

• 6.02 10²³

How many moles of water molecules are in 4.8 x 10²⁵ molecules of water?

• 8.0 10² moles

• 8.0 x 10¹ moles

• 1.3 x 10^-1 moles

• 1.3 x 10^-2 moles

How many atoms are in 0.075 mol of titanium?

• 1.2 x 10^-25

• 2.2 x 10²⁴

• 6.4 x 10²

• 4.5 x 10²²

How many moles of water molecules are in 4.8 x 10²⁵ molecules of water?

• 8.0 x 10² moles

• 8.0 x 10¹ moles

• 1.3 x 10^-1 moles

• 1.3 x 10^-2 moles

How many molecules are in 2.10 mol CO₂ ?

• 2.53 x 10²⁴ molecules

• 3.79 x 10²⁴ molecules

• 3.49 x 10^-24 molecules

• 1.26 x 10²⁴ molecules

The atomic masses of any two elements contain the same number of ____.

• atoms

• grams

• ions

• milliliters

Tags

NGSS.HS-PS1-7

Which of the following is NOT true about atomic mass?

• The atomic mass is 12 g for magnesium.

• The atomic mass is the mass of one mole of atoms.

• The atomic mass may be found by checking the periodic table.

• The atomic mass is the number of grams of an element that is numerically equal to the mass in amu.