Mole Pre-Quiz

Question 1
The mole in chemistry is a unit of measure and measures the number of objects.

True

False

Skip.

Question 2
Doubling the number of moles of particles will double the mass of the particles.

True

False

Skip.

Question 3
Doubling the number of moles of particles means that there will be twice as many particles.

True

False

Skip.

Question 4
Two moles of hydrogen has the same mass as two moles of carbon.

True

False

Skip.

Question 5
Two moles of apples would be:

3.01 x 10²³ apples.

6.02 x 10²³ apples.

12.04 x 10²³ apples.

None of the above.

Skip.

Question 6
For one mole of hydrogen atoms and one mole of helium atoms:

The number of hydrogen atoms will be double the number of helium atoms.

The number of hydrogen atoms will be half the number of helium atoms.

The number of hydrogen atoms will be the same as the number of helium atoms.

None of the above.

Skip.

Question 7
For one mole of hydrogen atoms and one mole of helium atoms:

The mass of hydrogen will be double the mass of helium.

The mass of hydrogen will be half the mass of helium.

The mass of hydrogen will be the same as the mass of helium.

None of the above.

Skip.

Question 8
One liter of a gas will contain about 0.041 moles of the gas particles. How many moles of gas and how many gas particles will be in 24.4 liters?

0.23 moles; 1.39 x 10²³ gas particles

0.46 moles; 2.77 x 10²³ gas particles

1.00 moles; 6.02 x 10²³ gas particles

None of the above.

Skip.

Question 9
A gram of lead, Pb, contains approximately 2.91 x 10²¹ atoms. How many moles in a gram of Pb atoms?

4.8 x 10^-3 moles

2.4 x 10^-3 moles

0.175 moles

Skip.

Question 10
One mole of helium, He, atoms has a mass of about four grams. How many helium atoms will there be in two grams of helium atoms?

12.06 x 10²³ atoms

6.02 x 10²³ atoms

3.01 x 10²³ atoms

None of the above.

Skip.

Question 11
The atomic weight of an element is the

molar mass of the element.

mass of one mole of the atoms of the element.

atomic mass.

All of the above.

None of the above.

Skip.

Question 12
The non-integer number on the periodic table is the atomic weight of that element.

True

False

Skip.

Question 13
The atomic weight is actually the weighted average of the naturally occurring isotopes of the element.

True

False

Skip.

Question 14
The molecular weight is obtained by adding the atomic weights of the atoms that make up the molecule.

True

False

Skip.

Question 15
The molar mass of Br is approximately

35 g/mole.

80 g/mole.

160 g/mole.

None of the above.

Skip.

Question 16
The molar mass of Br₂ is

40 g/mole

80 g/mole

160 g/mole

None of the above.

Skip.

Question 17
The molecular weight of NH₃ is

37 g/mole

28 g/mole

17 g/mole

None of the above.

Skip.

Question 18
Which of the following substances has a molecular weight of 34 g/mole?

NaCl

KI

PH₃

None of the above.

Skip.