18.75 moles O2
Work Step by Step
Looking at the coefficients, we need 2 moles of C8H18 for every 25 moles of O2. Therefore, if we need to burn 1.5 moles C8H18 then: 1.50 moles C8H18 * (25 moles O2/2 moles C8H18) = 18.75 moles O2
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