Font size
WorksheetsMole Concept w/ Problems
Total questions: 17
Worksheet time: 51mins
The Avogadro’s number is named after the Italian scientist ________.
Amedeo Avogadro
Armando Avogadro
Amethyst Avogadro
Alexander Avogadro
What is the molar mass of the element helium?
4 %
4 mol
4 g/mol
4 g
A mole of a substance contains ___ particles.
60.2x1023
6.02x1023
60.2x1024
6.02x1024
Which of the following does not belong to the group?
Mole
Pieces
Dozen
Pair
The ___________ is considered to be the simplest formula of a compound.
Molecules
Molecular formula
Empirical formula
Percentage composition
The _______ is equal to the ratio between the total mass of an element in the compound and the molar mass of the compound multiplied by 100.
Molecules
Molecular formula
Empirical formula
Percentage composition
The _____ gives the actual number of atoms present in any given compound.
Molar mass
Percentage composition
Empirical formula
Molecular formula
Which of the following is written in an empirical formula?
C4H5ON2
C6H12O6
C4H10
H2O2
How many formula units are there in 1.464 mole of zinc arsenate (Zn3(AsO4)2?
2.431 x 1024 atoms
8.832 x 1023 atoms
6.22 x 1023 atoms
6.022 x 1023 atoms
How many calcium atoms are in 0.250 moles of calcium?
3.09 x 1023 Ca atoms
1.51 x 1023 Ca atoms
2.03 x 1023 Ca atoms
2.56 x 1023 Ca atoms
How big is one mole of softballs compared to the Earth?
Smaller than the Earth
The same size as the Earth
Larger than the Earth
Cannot be compared
What is the mass of 6.02 x 1023 platinum atoms?
30.97 g
106.42 g
140.91 g
195.09 g
What is the empirical formula of a compound with 25.940% nitrogen, 74.060% oxygen?
NO
NO2
N2O5
N2O3
Which of the following statements regarding the mole is incorrect?
A mole is a counting unit equal to 6.02 x 1023 atoms.
The number of atoms in a mole is known as Avogadro’s number.
A mole of atom of an element is numerically equal to the atomic mass of the element.
All other statements are true.
What is the percent by mass of calcium in CaF2?
24%
51%
49%
65%
Find the percent compositions of all of the elements in the compound (NH4)3PO4.
A compound contains 75.46% carbon, 4.43% hydrogen, and 20.11% oxygen by mass. It has a molar weight of 318.31 g/mol. What is the empirical formula and molecular formula?
