If we talk about the balanced chemical equation of photosynthesis  the reactants, six carbon dioxide molecules and six water molecules, convert into a glucose (sugar molecule) and six oxygen molecules, the products d by the light energy captured by chlorophyll.
which means, one mole of glucose can be produced by six mole of carbon dioxide.
or can say that, six moles of carbon dioxide molecules will be needed to produce one mole of glucose.
6(number of moles of carbon dioxide) = 1(number of moles of glucose)
number of moles of carbon dioxide = (number of moles of glucose)/6
We are given with,
Number of moles of glucose produced = 2.4 moles
number of moles of carbon dioxide = 2.4/6
number of moles of carbon dioxide = 0.4 moles
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