Final answer:
100 cm³ of hydrogen reacts with 50 cm³ of oxygen according to the balanced reaction equation, leaving 150 cm³ of oxygen unreacted when 200 cm³ of oxygen is initially present.The correct answer is C. 150 cm³.
Step-by-step explanation:
The question revolves around the reaction between hydrogen and oxygen in a eudiometer. Given the volumes of hydrogen and oxygen, one has to determine the volume of oxygen that will be left unreacted after the reaction.
The reaction is a combustion of hydrogen, which follows the balanced equation:
2H2(g) + O2(g) → 2H2O(g).
From this equation, we can see that two volumes of hydrogen react with one volume of oxygen. Therefore, 100 cm³ of hydrogen would need 50 cm³ of oxygen to fully react. Since we start with 200 cm³ of oxygen, there will be 200 cm³ - 50 cm³ = 150 cm³ of oxygen unreacted.
The correct answer is C. 150 cm³.