Question

Molten Iron fills a mould, which as a volume of 200cm cubed.

Calculate the volume when the iron cools and solidifies.

Answer 1

175 cm^3

Step-by-step explanation:

To solve this problem, one should know the density of iron in both liquid and solid states. Molten iron has a density of 7.0g/cm^3. while solid iron has a density of 8.0g/cm^3.

The mass of the iron won't change, therefore:

`m_(solid)=m_(molten)\\d_(solid)*v_(solid)=d_(molten)*v_(molten)\\v_(solid)= (7*200)/(8) \\v_(solid)=175`

The volume when the iron cools and solidifies is 175 cm^3