Answer Posted / neelakanth pattar

As per ideal gas law
PV = mRT
Data : P-pressure-101.330Kpa at atm
T-273K std
R-0.287 Kpa/Kr.k
V-1 m3

So. 101.330 x 1 = m x 0.287 x 273
m = 1.295 Kg
i.e , 1 Nm3/hr = 1.295 Kg/hr
20 Nm3/hr = 20x1.2929 kg/hr

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