WorksheetsMole Concept
Total questions: 15
Worksheet time: 41mins
What is the mass of 6.02 x 1023 platinum atoms?
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
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 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
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
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%
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
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
How many grams are in 1.2 x 1024 molecules of CO?
28.2 g
55.8 g
6.02 g
1.2 g
How many grams of silicon would there be in a sample that contained 9.99 x 1022 atoms?
1.69 g
4.66 g
1.66 g
1.79 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
What is the percent by mass of calcium in CaF2?
24%
49%
51%
65%
In which compound is the percent composition by mass of Cl equal to 42%?
HClO
HClO2
HClO3
HClO4
Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?
K
C
N
None of the above
