The gases X and Y react with each other to produce gas Z according to the equation: 2X(g) + Y(g) → 2Z(g) 100 cm3 of X was mixed with 10 cm3 of Y, in a freely moving gas syringe sealed with a rubber cap. The reaction went to completion. All volumes were measured at the same temperature and pressure. What is the final volume of gas in the syringe?

Answer:

26) D

From the equation given, amount of gas X used will be equal to the amount of Z produced.

Since the reaction occurred in a tightly sealed syringe under exclusion of air and to completion, 100cm³ of gas Z will be produced (since 100cm³ of gas X was used).