1. The problem statement, all variables and given/known data How much helium (density 0.18) is requires to lift a 340kg balloon. density of air is 1.28 2. Relevant equations 3. The attempt at a solution\ i dont know why i keep getting the wrong answer buoyant force required is 340g which = rho g V and i keep getting 1888.89m^3 which i can see is way to big, what i cant see is what is wrong with my procedure???