Final answer:
The formula for freezing point depression in Chemistry is ΔTf = i * Kf * m. Additionally, stoichiometric calculations based on chemical equations, like the decomposition of H2O2 to O2, involve setting up ratios to solve for desired quantities.
Step-by-step explanation:
The formula mentioned seems to refer to a calculation within the realm of Chemistry, possibly related to freezing point depression or the decomposition of substances. Typically, in high school chemistry, calculations involving the freezing point depression would make use of the equation ΔTf = i * Kf * m, where ΔTf represents the change in freezing point, i is the van 't Hoff factor indicating the number of particles the solute splits into or forms in solution, Kf is the cryoscopic constant (freezing point depression constant), and m is the molality of the solution.
Another related topic might be the stoichiometric calculation based on a balanced chemical equation, as implied by the reference to the decomposition of H2O2 (hydrogen peroxide) and the formation of O2 (oxygen gas). For example, if the balanced equation for the decomposition of H2O2 indicates that 2 moles of H2O2 produce 1 mole of O2, and you have 0.28 moles of H2O2, then you would solve for the amount of O2 produced by setting up a ratio: (0.28 moles H2O2) x (1 mole O2 / 2 moles H2O2) = 0.14 moles O2.