Final answer:
The mass of a 40 cm³ piece of gold is 772g.
Step-by-step explanation:
The density of gold is 19.3 g/cm³. To find the mass of a 40 cm³ piece of gold, we can use the formula:
Mass (m) = Density (d) * Volume (V)
Substituting the given values, we get:
Mass = 19.3 g/cm³ * 40 cm³
Mass = 772 g
Therefore, the mass of a 40 cm³ piece of gold is 772g.