WorksheetsEmpirical/Molecular Formula
Total questions: 11
Worksheet time: 22mins
Name
Class
Date
1.
Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.
a)
CrCl
b)
CrCl3
c)
Cr3Cl
d)
Cr2Cl6
2.
A compound contains 18.8% Na, 29.0% Cl, and 52.5% O by mass. Determine the empirical formula.
a)
NaClO
b)
NaClO4
c)
Na2Cl2O8
d)
NaCl2O4
3.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2
d)
MgN
4.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
5.
A formula with the lowest ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula
d)
Distance Formula
6.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
7.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
(a)
8.
EF = CF2
Molecular formula mass = 192
MF =
Molecular formula mass = 192
MF =
a)
C4F8
b)
C4F
c)
CF8
d)
C2F4
9.
?
a)
CH4N20
b)
CH4N0
c)
CHN20
d)
C2H4N208
10.
What do you do when you get a half in the ratio?
a)
add 2 to each element
add two to only the one with the half
add two to only the one with the half
b)
multiply the one with the half only by two
c)
multiply all of them by two
d)
add two to all of the ratios
11.
Do you understand this topic?
a)
Yes
b)
No
c)
Sort of
d)
I need more practice
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