Stearic acid (C_18 H_36 O_2) is a typical fatty acid, a molecule with a long hyd

Question

Stearic acid (C_18 H_36 O_2) is a typical fatty acid, a molecule with a long hydrocarbon chain and an organic acid group (COOH) at the end. It is used to make cosmetics, ointments, soaps, and candles and is found in animal tissue as part of many saturated fats. In fact, when you eat meat, chances are that you are ingesting some fats that contain stearic acid. Calculate the heat (q) in kJ and kcal when 39.8 g of stearic acid is burned completely given that Delta H degree _f = -948 kJ/mol. kJ kcal

Explanation / Answer

mass of acid = 39.8 g

molar mass of acid =284.5 g / mol

moles of acid = 39.8 / 284.5

                       = 0.140

delta H = - q / n

-948 = - q / 0.140

q = 133kJ

q = 31.7 kcal

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