The density of magnesium is 1.7 g/cm3, and the density of iron is 7.9 g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?

mass of Mg=0.016g

Explanation:

P (Mg) = 1.7g/cm³

P (Fe) = 7.9g/cm³

m (Fe) = 819g

P (Fe) = m (Fe) / v (Fe)

7.9=819/v (Fe)

v (Fe) = 0.0096cm³

since v (Mg) = v (Fe)

=0.0096cm³

P (Mg) = m (Mg) / v (Mg)

1.7=m (Mg) / 0.0096

m (Mg) = 0.016g