Mole Calculations Multiple Choice Review

Mole Calculations Multiple Choice Review

PSI Chemistry Name_________________________________

The Mole and Avogadro's Number

What is the SI unit for measurement of number of particles in a substance ?

kilogram

ampere

candela

mole

Kelvin

How many moles of tungsten atoms are there in 4.8 x 1025 atoms of tungsten?

1.3 x 10-1 moles

8.0 x 10-1 moles

1.3 x 10-2 moles

80 moles

8.0 x 102 moles

How many moles of silver atoms are there in 1.8 x 1020 atoms of silver?

3.0 x 102

3.3 x 10-3

3.0 x 10-4

1.1 x 1044

None of the above

How many atoms are there in 5.7 mol of hafnium?

3.43 x 1024 atoms

1.06 x 1022 atoms

1.06 x 1023 atoms

3.43 x 1023 atoms

6.02 x 1023 atoms

How many atoms are there in 0.075 mol of titanium?

1.2 x 10-25

6.4 x 102

4.5 x 1022

3.6

2.2 x 1024

How many molecules are there in 2.1 mol CO2?

1.26 x 1024 molecules

3.49 x 10-24 molecules

2.53 x 1024 molecules

3.79 x 1024 molecules

1.05 x 10-23 molecules

How many ammonium ions, NH4+, are there in 5.0 mol (NH4)2S?

3.4 x 102

6.0 x 1024

6.0 x 1025

3.0 x 1024

1.5 x 1025

Butanol is composed of carbon, hydrogen, and oxygen. If 1.0 mol of butanol contains 6.0 x 1024 atoms of hydrogen, what is the subscript for the hydrogen atom in C4H?O?

1

8

6

4

10

How many moles of helium atoms are there in 2.4 x 1024 helium atoms?

4.0 mol

10.0 mol

2.4 x 1024 mol

2.0 mol

6.0 mol

How many atoms are there in 3.5 moles of arsenic atoms?

5.8 x 10-24 atoms

7.5 x 101 atoms

2.6 x 102 atoms

2.1 x 1024 atoms

1.7 x 1023 atoms

How many bromide ions are there in 1.5 moles of MgBr2?

2.8 x 102 ions

1.8 x...