WorksheetsMole Concept
Total questions: 14
Worksheet time: 1hrs 10mins
What is the mass of 6.02 x 1023 platinum atoms? Round to the nearest hundredths place.
30.97 g
106.42 g
140.91 g
195.09 g
A student needs 65.0 g of copper(II) chloride for an experiment. How many atoms of copper is this?
2.91 x 10^23 atoms
3.91 x 10^25 atoms
2.35 x 10^23 atoms
4.70 x 10^23 atoms
The molecular formula for a carbon and hydrogen compound is C8H18. What is the empirical formula?
C8H18
C9H4
C18H8
C4H9
If one Monster energy drink contains 0.16 g of caffeine, how many moles of caffeine do we consume when we drink 1 can? The chemical formula for caffeine is C8H10N4O2.
194.19 moles
1.07 moles
0.00082 moles
1213.69 moles
Which of the following statements regarding the mole is incorrect?
A mole is a counting unit equal to 6.02 x 1023 particles.
The number of particles in a mole is known as Avogadro’s number.
A mole of particles of an element is numerically equal to the atomic mass of the element.
none of the above
Mylanta, a common antacid, contains magnesium hydroxide, Mg(OH)2. How many moles of magnesium hydroxide are in 75.0 g of magnesium hydroxide?
0.551 moles
0.778 moles
1.29 moles
1.82 moles
Which of the following compounds is correctly matched with its empirical formula?
Dihydrogen dioxide - H2O2
Hydrogen dioxide - H2O
Tetrahydrogen dioxide - H4O2
Dihydrogen dioxide - HO
Acetone, C3H6O, is the main component of fingernail polish remover. What is the molar mass of acetone to the nearest hundredths place?
29.018 g/mol
34.058 g/mol
58.1 g/mol
58.08 g/mol
What is the percent composition of hydrogen in water?
89.8%
11.2%
66.7%
33.3%
An empirical formula is defined as _______?
The lowest whole number ratio of atoms in a formula.
The actual whole number ratio of atoms in a formula.
The formula showing the ratio of atoms in a formula.
The formula showing the ratio of moles in a formula.
Chalk is mostly made of calcium carbonate, CaCO3. If it took 48.6 g of chalk to write your name on the sidewalk, how many moles of calcium carbonate does your name contain?
0.486 mol
0.714 mol
1.40 mol
2.06 mol
Methyl acetate, is a solvent commonly used in paints, ink, and adhesives, and is often identified by the formula CH₃COOCH₃. What is the empirical formula for methyl acetate?
CH2O
C6H12O6
C3H6O2
C1.5H3O
Ammonium nitrate, commonly known as ANFO, is a compound used to make explosive devices. How many grams are in one mole of ammonium nitrate to the nearest thousandths place?
31.014 g
45.021 g
48.045 g
80.043 g
A scientists analyzed an unknown sample and determined that it contained 5 moles of oxygen and 2 moles of nitrogen? Which of the following would be its molecular formula?
N2O5
N4O
NO
O2N5
