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The substance calcium is found to crystallize in a cubic lattice, with an edge length of 556.0 pm. If the density of solid calcium is 1.549 g/cm3, how many Caatoms are there per unit cell?
Your answer should be an integer:
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Explanation & Answer
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1.549 * (556e-10)^3 = 2.662e-22
Multiplying the density by the volume of 1 cube gives the mass of 1 cube.
2.662e-22 / 6.655 ×10-23
=4
Dividing by the atomic mass gives the answer of 4
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