Find the molar mass of Al2S3
1
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A
86.03 g/mol
B
53.96 g/mol
C
118.1 g/mol
D
150.2 g/mol
E
96.21 g/mol
Feb 13­5:52 PM
2
Choose the term that best completes the second relationship. dozen:eggs mole:________
A
atoms
B
size
C
6.02 x 1023
D
grams
Dec 13­3:02 AM
How many moles are in 6.41 g of SO2?
3
dozen:eggs
mole:_____
A
0.10
B
0.20
C
1.00
D
2.00
E
10.0
Dec 13­3:02 AM
4
How many grams are in 0.50 mole of NaOH?
A
80.0 g
B
40.0 g
C
D
E
Dec 13­3:02 AM
5
The number of particles in 1.0 mol of any substance is always
A
the molar mass
B
22.4 L
C
3.00 x 108
D
6.02 x 1023
20.0 g
10.0 g
5.00 g
Dec 13­3:02 AM
Dec 13­3:02 AM
1
How many moles are in 1.806 x 1024 atoms of neon?
6
How many formula units are in 0.250 moles of CaCl2?
7
A
1.00 mol
A
7.53 x 1022 formula units
B
3.00 mol
B
1.51 x 1023 formula units
C
6.00 mol
C
3.01 x 1023 formula units
D
8.00 mol
D
1.204 x 1024 formula units
E
10.0 mol
E
8.31 x 10­25 formula units
Dec 13­3:02 AM
Calculate the density of krypton at STP.
8
A
0.267 g/L
B
1.87 g/L
C
3.74 g/L
D
22.4 g/L
Dec 13­3:02 AM
Determine the molecular formula of the compound with an empirical formula of CH and a molecular mass of 78.110 g.
9
A
C2H2
B
C4H4
C
C3H3
D
C6H6
C8H8
E
Dec 13­3:02 AM
10 Based on the structural formula below, what is the empirical formula for tartaric acid, a compound found in grape juice.
Dec 13­3:02 AM
11
Choose the term that best completes the second relationship. mole: Avogadro's number molar volume : ______
A
mole
B
water
CHO
C
STP
C1H1.5O1.5
D
22.4 L
A
C2H3O3
B
C4H6O6
C
D
HO­CH­COOH
HO­CH­COOH
Dec 13­3:02 AM
mole:Avogadro's number
molar volume:_________
Dec 13­3:02 AM
2
12 Which of these statements is true of a balloon filled with 1.00 mol N2 gas at STP?
A
I only
B
I and II
C
I and III
D
II and III
E
I, II and III
I. The balloon has a volume of 22.4 L
II.The contents of the balloon have a mass
of 14.0 g
III. The balloon contains 6.02 x 1023 molecules
13 How many hydrogen atoms are in six molecules of ethylene glycol, HOCH2CH2OH?
A
6
B
36
C
6 x 6.02 x 1023
D
36 x 6.02 x 1023
Dec 13­3:02 AM
14 Allicin, C6H10S2O, 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? A
1.8 x 1023 atoms
B
10 atoms
C
3.0 x 1024 atoms
D
5.0 x 1023 atoms
C6H10S2O
Dec 13­3:02 AM
15 Calculate the percentage composition of each element in lead (II) chloride (PbCl2).
A
74.51% Pb, 25,49% Cl
B
80.00% Pb, 20.00% Cl
C
73.00% Pb, 37.00% Cl
D
33.33% Pb, 66.66% Cl
E
71.43% Pb, 28.57% Cl
Dec 13­3:02 AM
16 Determine the empirical formula of the compound that contains 17.15% carbon, 1.44% hydrogen, and 81.41% fluorine. A
CH3F
B
C2 H 3 F
C
CH2F2
D
CHF3
Dec 13­3:02 AM
Dec 13­3:02 AM
1. D
2. A
3. A
4. C
5. D
6. B
7. B
8. C
9. D
10. A
11. D
12. C
13. B
14. C
15. A
16. D
ANSWERS
Feb 14­8:54 PM
3