Phthalates used as plasticizers in rubber and plastic products are believed to a

Question

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in human. The value of deltaHcombustion for dimethylphthalate (C10H10O4) is 4685 kJ/mol.

Question 3 of 20 (1 point) IncorrectXIncorrect X Incorrect COAST Tutorial Problemm Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of AHcomb for dimethylphthalate (C10Ho04) is -4685 kJ/mol. Assume 1.115 g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 7.975 kJ/PC at 20.849"C" What is the final temperature of the calorimeter? Number Tools x 102

Explanation / Answer

Q = m c T
Q = quantity of heat in joules (J)
m = mass of the substance acting as the environment in
grams (g)
c = specific heat capacity (4.19 for H2O) in J/(g oC)
T = change in temperature = Tfinal - Tinitial in oC

Molar mass of C10H10O4 =194.18

Hence heat of combustion of 1.115 gm of compound = 4685 x 1.115/194.18= 26.90 kJ

26x 103 = 1.115 x 7.975 x 103 x (TFinal - 20.849)

Tfinal = 23.874 C

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