Chromium crystallizes in a body centered cubic lattice with a density of 7.20 g/cm3. Given that the length of an edge of the unit cell is 288.4 pm, what is the mass in grams of one chromium atom? [1 pm = 10-10 cm]   Question 22 options:   6.84x 0-19 g    8.64x 0-19 g   6.84x 0-23 g   8.64x 0-23 g   8.64x 0-20 g

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