Multiple Choice
Which first-row transition metal has the highest possible oxidation state of +6?
24. Transition Metals and Coordination Compounds
Atomic Radius & Density of Transition Metals
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Determine the % Cu by moles composition of the copper alloy in which zinc replaces one-quarter of the copper atoms (at room temperature).
A
25%
B
33%
C
50%
D
67%
E
75%
Verified step by step guidance1
Identify the composition of the alloy: The alloy is composed of copper (Cu) and zinc (Zn), where zinc replaces one-quarter of the copper atoms.
Define the initial number of copper atoms: Assume you start with 4 copper atoms. This is a convenient number because one-quarter of 4 is 1, which makes calculations straightforward.
Calculate the number of zinc atoms: Since zinc replaces one-quarter of the copper atoms, there will be 1 zinc atom replacing 1 copper atom, leaving 3 copper atoms.
Determine the total number of atoms in the alloy: The total number of atoms is the sum of the remaining copper atoms and the zinc atoms, which is 3 Cu + 1 Zn = 4 atoms.
Calculate the % Cu by moles: The percentage of copper by moles is the number of copper atoms divided by the total number of atoms, multiplied by 100. This is expressed as \( \frac{3}{4} \times 100 \% \).
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