Chemistry

Problem

A balloon of diameter 20 metre weighs 100 kg. Calculate its payload, if it is filled with He at 1.0 atm and 27°C. Density of air is

1.2 \text{ kg m}^{-3}

. [

R = 0.082 \text{ dm}^3 \text{ atm K}^{-1} \text{ mol}^{-1}

]