A tree branch is floating in water. The total volume of the branch is 1.12 m3 and 75.0 percent of the volume is submerged. The density of water is 1000 kg/m3. Find the mass of water displaced by the branch

Mass = Density x Volume.

You are given the density of the water, you need to find the volume of the branch that is submerged.

Volume of the branch that is submerged = 1.12 x 0.75 = 0.84 m^3

Now find the mass of the water:

Mass = 1000 x 0.84 = 840 kg.