What volume of oxygen gas is released from decomposing water if 5.00 mL of hydrogen gas is

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What volume of oxygen gas is released from decomposing water if 5.00 mL of hydrogen gas is produced (assume constant temperature and pressure)?  

2 H2O(l) → 2 H2(g) + O2(g) 

(a) 2.50 mL

(b) 5.00 mL

(c) 7.50 mL

(d) 10.0 mL

(e) 20.0 mL.

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