A block of iron has a mass of 826 g.What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25°C are provided: magnesium, 1.7 g/cm³; graphite, 1.8 g/cm³; iron, 7.9 g/cm³. A)1,400 g B)3,800 g C)830 g D)180 g E)none of them are within 10 g of the right answer.

Question

Quizplus · Accepted Answer

To find the mass of the magnesium block with the same volume as the iron block, first calculate the volume of the iron block using its density: Volume = Mass / Density = 826 g / 7.9 g/cm³ = 104.56 cm³. Then, use the volume to find the mass of the magnesium block: Mass = Volume x Density = 104.56 cm³ x 1.7 g/cm³ = 177.75 g, which is approximately 180 g.

A Block of Iron Has a Mass of 826 G