Aluminum crystallizes in a face-centered cubic lattice

CHEMISTRY · Single correct · ISC · Chemistry · Some Basic Concepts of Chemistry · Mole concept

Problem

Aluminum crystallizes in a face-centered cubic lattice. An alloy is produced in which 10.0 % of the Al atoms are replaced by Mg atoms, and the lattice parameter is unchanged. Given the atomic masses MAl=26.98 g mol−1M_{\text{Al}} = 26.98\,\text{g mol}^{-1} and MMg=24.31 g mol−1M_{\text{Mg}} = 24.31\,\text{g mol}^{-1}, what is the approximate percent change in density of the alloy relative to pure aluminum? (a) No significant change (b) Decreases by about 10 % (c) Decreases by about 1 % (d) Increases by about 1 %

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