Question

an empty flask as a mass of 123.4 grams. When the flask is filled with water, the mass is 211.6 grams. If 10.0 grams of zinc (d=7.14 g/cm3) are added to the flask filled with water (and the sides of the flask are dried from the displaced water) what is the new mass of the flask?

Answer 1

calculate the volume of water displaced

volume=masszinc/densityzinc

now calulate the mass of water displaced
mass=densitywater*volumewater

now
masstotal=211.6-masswaterdisplaced+10