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Q 2630191912.     An element with density 2.8 g `cm^-3` forms a f.c.c. unit cell with edge length `4 × 10^-8` cm. Calculate the molar mass of the element.
(Given : `N_A = 6.022 × 10^23 mol^-1`)
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)