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2H2(g) + O2(g) → 2H2 O(g) In the reaction above, what volume of hydrogen would...

2H2(g) + O2(g) → 2H2 O(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm3 of oxygen and 1000 cm3 of hydrogen are exploded in a sealed tube?
A. 200 cm3
B. 400 cm3
C. 600 cm3
D. 700 cm3?

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