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At the same temperature and pressure, 200 mL of H2 reacts fully with O2 to form steam. How much O2 is needed?
A200 mL
B50 mL
C100 mL
D400 mL
Answer & Solution
Correct answer: C. 100 mL
Hydrogen and oxygen combine in a 2 : 1 volume ratio, so 200 mL of hydrogen needs 100 mL of oxygen.
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