Question

A+100+gram+alloy+of+nickel+and+copper+consists+of+70+wt+%+ni+and+30+wt+%+cu.+what+are+the+atom+percentages+of+ni+and+cu+in+this+alloy?

Answer 1

Atomic percentages: 68% of copper and 32% of nickel.

How this is calculated?

The given alloy is 100 g ,

m(Cu) = 0,7 · 100 g = 70 g.

m(Ni) = 0,3 · 100 g = 30 g.

n(Cu) = m(Cu) ÷ M(Cu) = 70 g ÷ 63,546 g/mol

n(Cu) = 1,10 mol.

n(Ni) = m(Ni) ÷ M(Ni) = 30 g ÷ 58,71 g/mol

n(Ni) = 0,51 mol

n(Cu) : n(Ni) = 1,10 mol : 0,51 mol

%(Cu) = 1,1 mol ÷ 1,61 mol = 0,68 = 68 %.

Similarly, %(Ni)=32%

What are Cu-Ni alloys?

• Cu-Ni alloys are alloys of copper (base metal with the largest individual content) and nickel with or without other elements, whereby the zinc content may not be more than 1%.
• When other elements are present, nickel has the largest individual content after copper, compared with each other element.
• As with other copper alloys, it is necessary to distinguish between wrought alloys, which are processed to semi-finished products, and cast alloys, from which castings are produced by various casting processes.

To know more about  Cu-Ni alloys, refer:

brainly.com/question/16856761

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