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7 October, 06:32

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?

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  1. 7 October, 10:14
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    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
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