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Using the phase diagram below, determine the phase of the alloy with a composition of 20% Cu and a temperature of 1300℃.
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24. Transition Metals and Coordination Compounds
Atomic Radius & Density of Transition Metals
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Consider the substitutional Cu–Sn alloy that is 25% Cu by moles. What percentage of the copper atoms have been substituted with tin atoms?
A
25%
B
33%
C
50%
D
67%
E
75%
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Understand that a substitutional alloy is a mixture where atoms of one element replace atoms of another in the crystal structure.
Recognize that the problem states the alloy is 25% Cu by moles, meaning 25% of the total moles in the alloy are copper atoms.
Calculate the percentage of tin atoms by subtracting the percentage of copper atoms from 100%. This gives the percentage of the alloy that is tin.
Since the alloy is 25% copper, the remaining 75% must be tin. This means 75% of the copper atoms have been substituted with tin atoms.
Conclude that the percentage of copper atoms substituted with tin atoms is 75%.
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