When there is a question to calculate the mass of water displaced, you first need to find the density of the object.

Here, mass = 500g

volume = 450 cm³

density = m/V = 500/450 = 1.11 g/cm³

Next, you need to compare the object's density with density of water. There are two cases possible. Density of water is 1g/cm³

__Case-1: Density of object is equal to or more than 1g/cm__³

If the density of the object is more than density of water,

**it will submerge in water. When**** it submerges, it will displace water equal to it's volume.**

__Case-2: Density of object is less than 1g/cm__³

If the density of the object is more than density of water,

**it will float on water. **

When it floats, the

**ratio of **__volume submerged__ to __total volume of object__ is given by:

Coming to the problem,

density of our object = 1.11 g/cm³ > 1g/cm³(case-1)

So it will submerge.

Volume of water displaced = volume of object = 450cm³

mass of water displaced = density×volume = 1×450 = 450 gram

Mass of water displaced is 450g.

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If you want a simple solution without explanation:

mass = 500g

volume = 450 cm³

density = m/V = 500/450 = 1.11 g/cm³

density of object is more than density of water. So it will submerge and displace same volume of water.

So volume of water displaced = 450cm³

mass of water displaced = density×volume = 1×450 = 450 gram

Mass of water displaced is 450g.