A spherical balloon is made from a material whose mass is 3.79 kg. The thickness of the material is negligible compared to the 1.74-m radius of the...

A spherical balloon is made from a material whose mass is 3.79 kg. The thickness of the material is negligible compared to the 1.74-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 294 K and just floats in air, neither rising nor falling. The density of the surrounding air is 1.19 kg/m3. Find the absolute pressure of the helium gas.