Answer:
The answer is 100 cm³
Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question we have
[tex]volume = \frac{780}{7.8} \\ [/tex]
We have the final answer as
100 cm³
Hope this helps you
