The density of magnesium is 1.7 g/cm3, while that of iron is 7.9 g/cm3. A block of iron has a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
A) 4.7 g
B) 1.8 x 102 g
C) 3.8 x 102 g
D) 4.8 x 103 g
E) 8 x 103 g
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