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.

Prashant Kotian · Accepted Answer

Correct answer: B. combustion: c2h6(g) + 3.5 o2(g) → 2 co2(g) + 3 h2o(l). 10 ml of c2h6 reacts with 35 ml of o2 to form 20 ml of co2. leftover o2 = 5 ml. total dry gas volume = 20 + 5 = 25 ml. measured volume is 26 ml. the excess 1 ml is from water vapour. p_vapour / p_total = v_vapour / v_total → p_vapour = 760 × (1/26) = 29.23 mm hg.

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