WorksheetsMole Toolkit Review Quiz
Total questions: 17
Worksheet time: 4hrs 15mins
Which of the following is NOT needed to calculate percent mass composition?
Molar Mass of each specific element
Molar Mass of Compound
The mass percent of hydrogen in methane (CH4) is:
75%
92%
25%
4%
What is the mass percentage of carbon in carbon dioxide (CO2)?
27.27%
42.86%
72.73%
72.72%
Find the percentage composition of Mg in Mg3(PO4)2.
27.48% Mg
43.11% Mg
16.00% Mg
12.63% Mg
The mass % of aluminum in aluminum sulfate Al2(SO4)3 is:
45.70%
7.89%
35.94%
15.77%
A formula with the lowest whole number ratio of elements in a compound is called
CH3COOH
A compound is made up of 40.05% S and 59.95% O by mass. Find the empirical formula for these elements.
SO2
SO3
SO4
A compound consists of 72.2% magnesium (Mg) and 27.8% nitrogen (N) by mass. What is the empirical formula?
What is the empirical formula of a compound with 88.80% copper and 11.20% oxygen by mass?
What is the empirical formula of a compound that is 36.84% nitrogen and 63.16% oxygen by mass?
A chemical formula (sometimes called the real or true formula) that shows the actual number and kinds of atoms present in one molecule of a compound is called_________
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18 g/mol?
What is the molecular formula of a compound with a molecular mass of 696 g/mole and an empirical formula of K2SO4?
Glycerol has a molar mass of 92.09 g/mol. Its percent composition by mass is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula?
