A spherical balloon of 21 cm diameter is to be filled

A spherical balloon of 21 cm diameter is to be filled

Question
A spherical balloon of 21 cm diameter is to be filled up with hydrogen at N.T.P. from a cylinder containing the gas at 20 atmospheres at 27oC. if the cylinder can hold 2.82 litres of water, calculate the number of balloons that can be filled up.

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