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At an absolute pressure of 101.3 kPa and ten mperature of 20 degC the dynamic viscosity of a certain diatomic gas is 2*10^-5 Pa.sec and its kinematic viscosity is 15 mm^2s^-1. Taking the universal gas constant as 8310 kg-1.K-1 and assuming the gas to be perfect, calculate its approximate relative molecular mass.