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Hydrogen sulfide, H2S has a molar mass of  34.08088g/mol.
81. A flask with a volume of 1.50 L, provided with a stopcock, contains ethane gas (C 2 H 6) at 300 K and atmospheric pressure (1.013 Ã 10 5 Pa). The molar mass of ethane is 30.0 g/mol. The system is warmed to a temperature of 380 K, with the stopcock open to the atmosphere.5. Calculate the volume of 1.00 mol of liquid water at a temperature of 20 Â°C (at which its density is 998 kg/m 3 and compare this volume with the volume occupied by 1.00 mol of water at the critical point, which is 56 Ã 10 â6 m 3. Water has a molar mass of 18.0 g/mol.