A volume of 10 ml of ethane gas is mixed with 40 ml oxygen gas in an eudiometer tube at 30°C and fired. When the resulting gases are cooled to 30°C, the volume of eudiometer becomes 26 ml. What is the

Question

A volume of 10 ml of ethane gas is mixed with 40 ml oxygen gas in an eudiometer tube at 30°C and fired. When the resulting gases are cooled to 30°C, the volume of eudiometer becomes 26 ml. What is the vapour pressure of water at 30°C? Neglect the volume occupied by liquid water. Pressure is 1 atm and constant throughout.

TestHub · Accepted Answer

2C 2 H 6 + 7O 2 → 4CO 2 + 6H 2 O. 10 ml C 2 H 6 consumes 35 ml O 2 and gives 20 ml CO 2 ; O 2 left = 5 ml. Dry gases = 20 + 5 = 25 ml (at 1 atm equivalent). In the final 26 ml the dry gases occupy partial pressure 25/26 atm, so p(H 2 O) = 1/26 atm = 760/26 = 29.23 mm Hg. Confirms Ans: (b) 29.23 mm Hg.

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