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WorksheetsThe Mole Concept Quiz
Total questions: 14
Worksheet time: 22mins
Chemists use the mole in order to know the number of___________ in a substance.
I. ions
II. atoms
III. formula units
I only
II only
II and III only
I, II and III
One mole of a pure substance_________.
contains 1.2 × 1023 molecules
has a mass called atomic mass
has Avogadro’s number of particles
contains twice the number of particles as 12 g of carbon-12
The molar mass of ammonium nitrate, NH4NO3 , is ___________ g/mol. (H = 1, N = 14, O = 16)
80
66
48
34
What is the mass of 3.0 moles of H2S? (H = 1, S = 32)
3.0 g
32 g
34 g
102 g
A 3.0 moles sample of NH3 contains ________ hydrogen atoms.
1.2 × 1023
1.2 × 1024
5.4 × 1024
9.0 × 1024
How many moles are there in 88 g of CO2 ? ( C = 12, O = 16)
0.50 moles
2.0 moles
4.0 moles
8.8 moles
The molar mass has a unit of _____.
mol/g
g/mol
mol/L
L/mol
How many molecules are there in 0.50 mol of CH3OH?
8.3 × 1021
5.0 × 1022
3.0 × 1023
3.0 × 1024
The representative particles in a sample
nitrogen gas, N2, are _________.
ion
atom
molecule
formula units
Calculate the number of moles for 4.8 × 108 formula units of NaCl
4.8 x 1024
8.0 x 1016
8.0 x 10-16
2.88 x 1032
Propylene glycol, C3H6(OH)2, is used in almost every commercially made body care product in the world. Cosmetic companies use it as an inexpensive substitute for a more expensive and natural ingredient, such as honey or vegetable glycerin. Answer questions a – d. (You must show all your work for each question)
a. Calculate the number of atoms of hydrogen present in 2.0 moles of C3H6(OH)2.
Calculate the molar mass of propylene glycol, C3H6(OH)2. (H = 1, C = 12, O = 16)
Calculate the number of molecules present in 7.6 g of C3H6(OH)2. (H = 1, C = 12, O = 16)
Calculate the number of moles in 38 g of propylene glycol, C3H6(OH)2. (H = 1, C = 12, O = 16)
