What STP volume of hydrogen gas is produced from decomposing 5.00 g of water (18.02 g/mol)?

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What STP volume of hydrogen gas is produced from decomposing 5.00 g of water (18.02 g/mol)?  

2 H2O(l) → 2 H2(g) + O2(g)

(a) 1.55 L

(b) 3.11 L

(c) 5.00 L

(d) 6.22 L

(e) 12.4 L.

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