a.) Zinc metal is currently used for gas production. Compare the ratio by mass o
ID: 1007168 • Letter: A
Question
a.) Zinc metal is currently used for gas production. Compare the ratio by mass of Mg and Al to that of Zn for preparing the same volume of hydrogen gas. Use the data recorded in Table 3 for your calculations. Record your calculated results for 50mL, 75mL, 100mL, and average.
b) will the same mass of each metal produce the same volume?
Sample 1
Team
Metal
Acid
Assigned Mass (g)
Actual Mass (g)
Volume H2 Gas (mL)
1A
Mg
1M
0.05
0.051
46
1B
Zn
6M
0.05
0.051
21.8
2
Al
4M
0.05
0.053
76
3A
Al
4M
0.05
0.048
65
3B
Mg
1M
0.075
0.077
82
4A
Al
4M
0.075
0.079
120
4B
Zn
6M
0.05
0.050
22
5A
Mg
1M
0.05
0.051
42
5B
Zn
6M
0.075
0.077
27
Sample 2
0.125
0.123
118
0.125
0.126
42.5
0.125
0.128
197
0.100
0.099
144
0.100
0.104
90
0.100
0.104
155
0.125
0.133
50
Sample 3
0.2
0.198
206
0.2
0.206
82.2
0.2
0.201
298
0.15
0.154
215
0.15
0.153
170
0.15
0.155
225
0.2
0.198
77
0.2
0.199
228
0.150
0.151
48
Sample 1
Team
Metal
Acid
Assigned Mass (g)
Actual Mass (g)
Volume H2 Gas (mL)
1A
Mg
1M
0.05
0.051
46
1B
Zn
6M
0.05
0.051
21.8
2
Al
4M
0.05
0.053
76
3A
Al
4M
0.05
0.048
65
3B
Mg
1M
0.075
0.077
82
4A
Al
4M
0.075
0.079
120
4B
Zn
6M
0.05
0.050
22
5A
Mg
1M
0.05
0.051
42
5B
Zn
6M
0.075
0.077
27
Sample 2
0.125
0.123
118
0.125
0.126
42.5
0.125
0.128
197
0.100
0.099
144
0.100
0.104
90
0.100
0.104
155
0.125
0.133
50
Sample 3
0.2
0.198
206
0.2
0.206
82.2
0.2
0.201
298
0.15
0.154
215
0.15
0.153
170
0.15
0.155
225
0.2
0.198
77
0.2
0.199
228
0.150
0.151
48
Explanation / Answer
Metal
Acid
Assigned Mass (g)
Actual Mass (g)
Volume H2 Gas (mL)
1A
Mg
1M
0.05
0.051
46
1B
Zn
6M
0.05
0.051
21.8
2
Al
4M
0.05
0.053
76
3A
Al
4M
0.05
0.048
65
3B
Mg
1M
0.075
0.077
82
4A
Al
4M
0.075
0.079
120
4B
Zn
6M
0.05
0.050
22
5A
Mg
1M
0.05
0.051
42
5B
Zn
6M
0.075
0.077
27
Consider the actual mass and volume of hydrogen gas for Mg:
0.051 g 46 mL
0.077 g 82 mL
0.051 g 42 mL
Taking the average of masses and volumes:
Average mass = (0.051+0.077+0.051) / 3 = 0.0597 g
Average volume = (46 + 82 +42) / 3 = 56.7 mL
So mass of Mg per mL of H2 = 0.0597 g /56.7 mL = 0.00105g/ mL
Similarly for Al:
0.053 g 76 mL
0.048 g 65 mL
0.075 g 120 mL
Average mass = (0.053+0.048+0.075)/ 3 = 0.059 g
AVerage volume = (76 + 65 + 120) / 3 = 87 mL
So mass of Al per mL of H2 = 0.059 g/ 87 mL = 6.78*10^-4 g/ mL
For Zn:
0.051 g 21.8 mL
0.050 g 22 mL
0.077 g 27 mL
Average mass = (0.051+0.050+0.077) / 3 = 0.059 g
Average volume = (21.8+22+27) = 23.6 mL
Mass of zinc per mL of H2 = 0.059 g / 23.6 mL = 0.0025 g/ mL
(a) So, mass of Mg and Al = 0.00105 g + 6.78*10^-4 g = 0.001728 g
Mass of zinc = 0.0025 g
So more zinc is required than the sum of mass of Mg and Al
(b) No, each metal produces different volumes of H2 per gram
Metal
Acid
Assigned Mass (g)
Actual Mass (g)
Volume H2 Gas (mL)
1A
Mg
1M
0.05
0.051
46
1B
Zn
6M
0.05
0.051
21.8
2
Al
4M
0.05
0.053
76
3A
Al
4M
0.05
0.048
65
3B
Mg
1M
0.075
0.077
82
4A
Al
4M
0.075
0.079
120
4B
Zn
6M
0.05
0.050
22
5A
Mg
1M
0.05
0.051
42
5B
Zn
6M
0.075
0.077
27
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