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An alloy of copper and gold crystallizes...

An alloy of copper and gold crystallizes in cubic lattic, in which the `Au-` atoms occupy the lattice points at the corners of cube and `Cu-` atoms occupy the centre of each face. The formula of this alloy is `:`

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`Au=^(1)/(8)=1`, Cu=(1)/(2)xx6=3`
Formula=`AuCu_(3)`
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