The formula for oxalic acid is (COOH)2. How
many atoms does each molecule contain?
1.
2.
3.
4.
5.
6
4
8
10
5
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
What is the molecular formula
for acetic acid?
1.
2.
3.
4.
5.
CH3COOH
CH3COCH3
CH3CH2OH
CH3CH2CO2H
CH3CH2OCH2CH3
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
What is the formula for iron(III)
oxide?
1.
2.
3.
4.
5.
FeO3
FeO2
Fe3O2
Fe2O3
Fe3O
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
Choose the name-formula pair
that does not correctly match.
1. magnesium phosphate
Mg3(PO4)2
2. ferrous sulfite FeSO3
3. silver carbonate AgCO3
4. potassium fluoride KF
5. cupric bromide CuBr2
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
If 6.653 g of calcium combines exactly with 26.53 g of
bromine and 12.29 g of zinc combines exactly with 30.04 g of
bromine, what is the mass ratio of one atom of calcium to one
atom of zinc?
1.
2.
3.
4.
5.
1.68
0.613
0.541
1.85
0.133
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
Calculate the number of atoms in
40.5 g of aluminum.
1.
2.
3.
4.
5.
900
2.5 x 10-24
9.0 x 1023
6.6 x 1026
1.8 x 10-21
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
What is the formula weight of
Fe(NH4)2(SO4)2•6H2O?
1.
2.
3.
4.
5.
392 amu
384 amu
412 amu
376 amu
436 amu
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
How many atoms of hydrogen
are there in 88 g of C6H6?
1.
2.
3.
4.
5.
3.6 x 1023
6.8 x 1022
2.6 x 1023
4.1 x 1024
5.3 x 1023
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
How many hydrogen atoms are present in
7.50 g of (NH4)2Fe(SO4)2•6H2O?
1.
2.
3.
4.
5.
5.16 x 1022
2.30 x 1023
1.15 x 1022
4.65 x 1023
3.35 x 1024
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
Calculate the percent
composition of FeSO4.
1.
2.
3.
4.
5.
%Fe = 27.9%, %S = 24.1,
%O = 48.0%
%Fe = 16.2% , %S = 27.9%,
%O = 55.8%
%Fe = 33.2% , S = 9.5% ,
%O = 57.2%
%Fe = 36.8%, S = 21.1%,
%O = 42.1%
%Fe = 25.1%, %S = 21.6% ,
%O = 53.2%
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
What would be the empirical formula for a
compound containing 33.36% calcium,
26.69% sulfur, and 39.95% oxygen?
1.
2.
3.
4.
5.
CaSO4
CaSO2
CaSO
CaSO3
Ca2S2O5
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
The complete combustion of a hydrocarbon
produced 352 mg of CO2 and 216 mg of H2O. What
is the simplest formula of this hydrocarbon?
1.
2.
3.
4.
5.
CH
CH
C2H3
CH3
C3H2
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
The complete combustion of a hydrocarbon produced 26.4 g
of CO2 and 5.40 g of H2O. Another experiment determined
the molecular weight of this hydrocarbon to be approximately
52 g/mol. What is its molecular formula?
1.
2.
3.
4.
5.
C2H4
CH
C4H4
C2H2
CH4
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
What mass of lead is present in 5.05 kg
of mendipite, PbCl2•2PbO?
1.
2.
3.
4.
5.
2.89 kg
4.05 kg
5.05 kg
3.68 kg
4.33 kg
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40
What mass of fluorine is contained in 2.00 tons of
cryolite that is 42.0% pure Na3A1F6? (No other
compounds containing fluorine are present.)
1.
2.
3.
4.
5.
912 lb
832 lb
456 lb
304 lb
152 lb
20% 20% 20% 20% 20%
1
2
3
4
5
6
7
8
9
10
11
12
113
14
21
22
23
24
25
26
27
28
29
30
31
32
33
34
41
42
43
44
45
46
47
48
49
50
2
15
16
3
17
418
19
35
36
37
38
39
5
20
40