Aluminum 5056 is an aluminum alloy often used in the aircraft industry. It has t
ID: 969293 • Letter: A
Question
Aluminum 5056 is an aluminum alloy often used in the aircraft industry. It has the composition listed below.
a. What is the weight% of each element in 5056?
b. If we want 200g of Al 5056, how many grams of each element must we combine to achieve this composition?
Element
mol% in 5056
Atomic weight (g/mol)
Density (g/cm3)
Aluminum (Al)
95.0
26.981
2.699
Magnesium (Mg)
4.76
24.312
1.738
Manganese (Mn)
0.12
54.938
7.47
Chromium (Cr)
0.12
51.996
7.19
Element
mol% in 5056
Atomic weight (g/mol)
Density (g/cm3)
Aluminum (Al)
95.0
26.981
2.699
Magnesium (Mg)
4.76
24.312
1.738
Manganese (Mn)
0.12
54.938
7.47
Chromium (Cr)
0.12
51.996
7.19
Explanation / Answer
Element
mol% in 5056
No. of moles
Atomic weight (g/mol)
Mass of element (g)
Weight % (mass/total mass)
Mass in 200 g of 5056
Density (g/cm3)
Aluminum (Al)
95
0.95
26.981
25.63195
95.22403288
190.44807
2.699
Magnesium (Mg)
4.76
0.0476
24.312
1.1572512
4.299248646
8.5984973
1.738
Manganese (Mn)
0.12
0.0012
54.938
0.0659256
0.244917047
0.4898341
7.47
Chromium (Cr)
0.12
0.0012
51.996
0.0623952
0.231801427
0.4636029
7.19
Total
100
26.917522
200
Element
mol% in 5056
No. of moles
Atomic weight (g/mol)
Mass of element (g)
Weight % (mass/total mass)
Mass in 200 g of 5056
Density (g/cm3)
Aluminum (Al)
95
0.95
26.981
25.63195
95.22403288
190.44807
2.699
Magnesium (Mg)
4.76
0.0476
24.312
1.1572512
4.299248646
8.5984973
1.738
Manganese (Mn)
0.12
0.0012
54.938
0.0659256
0.244917047
0.4898341
7.47
Chromium (Cr)
0.12
0.0012
51.996
0.0623952
0.231801427
0.4636029
7.19
Total
100
26.917522
200
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