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The density of cr atoms is 7.2g/cm. If the unit cell has edge length 289 pm. Calculate the number of chromium atoms per unit cell. (at mass of cr = 52)


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Density $\rho = \large\frac{Z\times at.wt}{a^3\times N_A}$
$Z = \large\frac{\rho\times a^3\times N_A}{at.wt}$
$\therefore n = 2$
Hence answer is (b)
answered Feb 24, 2014 by sharmaaparna1

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