Answer:
The mass is 25.68 g
Explanation:
To find the volume, you are going to use the amount of water displaced when the object is added. The water goes from 70 mL to 78mL, with an 8mL displacement.
An important formula to know for density equations is 1 milliliter is equal to 1 cm^3
So 8mL= 8cm^3 is the volume
The formula for density is Density = mass/volume
Density= 3.21 g/cm^3
Volume= 8cm^3
3.21 g/cm^3 = mass / 8cm^3
8 cm^3 * 3.21 g/cm^3 =
The cm^3 cancels out leaving the mass at 25.68 g
I hope this helps! :)