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According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

We are hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?

Is this correct if not can u correct me