Question

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of Hcomb for dimethylphthalate (C10H 1004) is -4685 kJ/mol. Assume 0.970 g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 6.90 kJ/°C at 21.0 °C. What is the final temperature of the calorimeter?

Answer 1

Augwers motex of Clomio o = mas molarmas = 0.970g - 0.0 = 0.970g = 0.005 mol Tgqgmory for 1 mo ClohioOg ; om= 4685 kJ for 0.005 mol COM100 ; OH = 4685 KJ X 0.005 mol 1 mes = 23.425 kJ Let final temperature be Toc a = c calxoto - 23.425 kJ = 6.90 kJ /°C X CT-21.00€ - 23.425 kJ = 6.90 kJ/°CX T - 144.9 kJ 6.go KJ 1°C XT= 24.4°C laugwal