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Worksheetsmole & Empirical
Total questions: 15
Worksheet time: 27mins
Name
Class
Date
1.
Which substance has the greatest molecular mass?
a)
H2O2
b)
NO
c)
CF4
d)
I2
2.
What is the number of moles of 112 liter chlorine gas at STP?
a)
3 mol
b)
4 mol
c)
5 mol
d)
6 mol
3.
What is the mass of 0.2 mol of Al? (Al:27g/mol)
a)
27 g
b)
54 g
c)
5.4 g
d)
2.7 g
4.
How many moles are in 225 g of CO?
a)
28.01 mole
b)
4.82 x 1024 mole
c)
0.124 mole
d)
8.03 mole
5.
Find the molar mass of C8H18.
a)
114 g/mol
b)
26 g/mol
c)
66 g/mol
d)
338 g/mol
6.
How many grams are in 7.8 moles of NaCl?
a)
476grams
b)
460 grams
c)
452 grams
d)
462 grams
7.
Determine the amount of moles in 1.50 x 1023 atoms of fluorine.
a)
4.013 moles
b)
0.249 moles
c)
4.73 moles
d)
0.0131 moles
8.
Determine the number of atoms in 1.50 g of carbon.
a)
0.125 atoms
b)
7.52 x 1022 atoms
c)
1.08 x 1025 atoms
d)
2.07 x 10-25 atoms
9.
What is the mass of Na atom that contains 12.04 X 1023 atoms in its structure? (Na:23g/mol)
a)
11.5 g
b)
23 g
c)
34.5 g
d)
46 g
10.
An empirical formula:
a)
is a formula that calculates the coefficients of a compound in a balanced equation.
b)
is the simplest whole-number ratio of moles of elements in the compound.
11.
What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?
a)
NO
b)
N2O3
c)
N2O4
d)
N2O5
12.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
13.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
14.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4
b)
K8SO16
c)
K8S4O8
d)
K8S4O16
15.
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
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