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At the same temperature and pressure, 300 mL of hydrogen combines with how much oxygen to form water vapour?
A300 mL
B150 mL
C600 mL
D100 mL
Answer & Solution
Correct answer: B. 150 mL
Hydrogen and oxygen combine in a 2 : 1 volume ratio, so 300 mL of hydrogen needs 150 mL of oxygen.
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