Given the balanced equation representing a reaction:
2co(g) + o2(g)< ==> 2co2(g)
what is the mole ratio of co(g) to co2(g) in this reaction?
(1) 1: 1 (3) 2: 1
(2) 1: 2 (4) 3: 2

The answer is (1) 1:1. The mole ratio of reactants or productions of a reaction is equals to the ratio of coefficient before these compounds. The important thing is this formula must be balanced.

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