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Untitled
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Subject: «subject»
Date: «date»
Find the molar mass of Al2S3
1
86.03 g/mol
53.96 g/mol
118.1 g/mol
150.2 g/mol
96.21 g/mol
A
B
C
D
E
2
Choose the term that best completes the second relationship.
atoms
size
6.02 x 1023
grams
A
B
C
D
How many moles are in 6.41 g of SO2?
3
0.10
0.20
1.00
2.00
10.0
A
B
C
D
E
How many grams are in 0.50 mole of NaOH?
4
A
B
C
D
E
80.0 g
40.0 g
20.0 g
10.0 g
5.00 g
The number of particles in 1.0 mol of any substance is always
5
A
B
C
D
the molar mass
22.4 L
3.00 x 108
6.02 x 1023
1
How many moles are in 1.806 x 1024 atoms of neon?
6
A
B
C
D
E
How many formula units are in 0.250 moles of CaCl2?
7
A
B
C
D
E
7.53 x 1022 formula units
1.51 x 1023 formula units
3.01 x 1023 formula units
1.204 x 1024 formula units
8.31 x 10­25 formula units
Calculate the density of krypton at STP.
8
A
B
C
D
9
1.00 mol
3.00 mol
6.00 mol
8.00 mol
10.0 mol
0.267 g/L
1.87 g/L
3.74 g/L
22.4 g/L
Determine the molecular formula of the compound with an empirical formula of CH and a molecular mass of 78.110 g.
A
B
C
D
E
C2H2
C4H4
C3H3
C6H6
C8H8
10 Based on the structural formula below, what is the empirical formula for tartaric acid, a compound found in grape juice.
A
B
C
D
11
C2H3O3
C4H6O6
CHO
C1H1.5O1.5
Choose the term that best completes the second relationship.
A
B
C
D
mole
water
STP
22.4 L
2
12 Which of these statements is true of a balloon filled with 1.00 mol N2 gas at STP?
A
B
C
D
E
I only
I and II
I and III
II and III
I, II and III
13 How many hydrogen atoms are in six molecules of ethylene glycol, HOCH2CH2OH?
A6
B 36
23
C 6 x 6.02 x 10
23
D 36 x 6.02 x 10
14 Allicin is the compound that gives garlic its odor. A sample of allicin contains 3.0 x 1023 molecules. How many atoms of hydrogen does this sample contain?
23
A 1.8 x 10 atoms
B 10 atoms
24
C 3.0 x 10 atoms
23
D 5.0 x 10 atoms
15 Calculate the percentage composition of each element in lead (II) chloride (PbCl2).
A
B
C
D
E
74.51% Pb, 25,49% Cl
80.00% Pb, 20.00% Cl
73.00% Pb, 37.00% Cl
33.33% Pb, 66.66% Cl
71.43% Pb, 28.57% Cl
16 Determine the empirical formula of the compound that contains 17.15% carbon, 1.44% hydrogen, and 81.41% fluorine. A
B
C
D
CH3F
C2H3F
CH2F2
CHF3
3