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Please help me #6!!!!!!!!

Please help me #6!!!!!!!!-example-1

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I believe that the answer is 12 because there is already 3 O molecules and since its in parentheses with 3 outside it that means that there are 3 of those CO molecules meaning that for every 1 CO there will be 3 O’s so 3, four times Is 12
User Holograham
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