Question

molten iron fills a mould, which has a volume of 200 cm cubed. Calculate the volume when the iron cools and solidifies. Molten iron has a density of 7.0g/cm cubed. In its solid state, iron has a density of 8.0g/cm cubed.

Answer 1

As we know that mass of the iron will remain same in solid state as well as in molten state as per mass conservation theory

Now we can say

$m_{initial} = m_{final}$

since mass is the product of volume and density so we can say

$V_i \rho_i = V_{final}\rho_{final}$

now from above equation we have

$(200 cm^3)(7 g/cm^3) = V_{final}(8 g/cm^3)$

now by solving above equation we have

$V_{final} = \frac{7}{8} (200 cm^3)$

$V_{final} = 175 cm^3$

so final volume after it get solidify will become 175 cm^3

Answer 2

Answer:

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