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v = 30 cm³
m = 200 g
d = m/v
d = 200 g / 30 cm³
d = 6.67 /cm³
2.
d hierro = 7.87 g/mL
V = 500 mL
m = ?
m = d x v
m = 7.86 g/mL X 500 mL
m = 3930 g