How many moles of water decompose to yield 0.500 mol of oxygen gas? 2 H 2 O(l)

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How many moles of water decompose to yield 0.500 mol of oxygen gas? 

2 H2O(l) → 2 H2(g) + O2(g) 

(a) 0.250 mol

(b) 0.500 mol

(c) 1.00 mol

(d) 2.00 mol

(e) None of the above.

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