Percent Composition, Empirical and Molecular Formula

Quiz
•
Science
•
11th Grade
•
Hard
Standards-aligned
Lisa Thompson
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The molecular and empirical formula of a compound are __________ the same.
always
sometimes
never
one and
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Chloroform, a toxic substance that may cause severe liver, kidney, and heart damage, has the percent composition by mass of this compound is 10.06% carbon, 0.84% hydrogen, and 89.09% chlorine. What is its molar mass in g/mol?
124.42
121.39
119.37
74.51
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Chloroform, a toxic substance that may cause severe liver, kidney, and heart damage, has the percent composition by mass of this compound is 10.06% carbon, 0.84% hydrogen, and 89.09% chlorine. If a compound which shares the same empirical formula as chloroform is known to have a molar mass of 223.53g/mol, what is the compound’s mole ratio with chloroform?
2
3
4
5
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Do the diagrams have the same molecular formula?
Yes
No
Tags
NGSS.MS-PS1-1
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following is NOT needed to calculate percent mass composition?
Molar Mass of each specific element
Molar Mass of Compound
Avogadro's Number
Division
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the percentage composition of Mg in Mg3(PO4)2.
27.48% Mg
43.11% Mg
16.00% Mg
12.63% Mg
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A formula with the lowest whole number ratio of elements in a compound is called
Molecular Formula
Chemical Formula
Empirical Formula
Distance Formula
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