A spherical balloon can hold 1.2 liters of helium. The balloon has a mass of 26 milligrams when empty. Helium has a density of 0.1785 grams per liter. What is the mass of the balloon when it is filled with helium?
So, we need first to calculate the mass of the helium in the balloon.
We are told that there are
Given this mass, the mass of the balloon is this mass + tare value