Calculate the amount of energy that is required to heat and completely vaporize a 125 g sample of liquid benzene at 301 K to gaseous benzene at 353 K(molar mass = 78.11 g/mol). The following physical data may be useful: △Hvap = 33.9 kJ/mol Cliq = 1.73 J/g°C Tmelting = 279.0 K Tboiling = 353.0 K

Calculate ΔH orxnfor the following: CH4(g) + Cl2(g) → CCl4(l) + HCl(g)[unbalanced]ΔH o/f[CH4(g)] = −74.87 kJ/molΔH o/f[CCl4(g)] = −96.0 kJ/molΔH o/f[CCl4(l)] = −139 kJ/molΔH o/f[HCl(g)] = −92.31 kJ/molΔH o/f[HCl(aq)] = −167.46 kJ/molΔH o/f[Cl(g)] = 121.0 kJ/mol

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of ΔHcomb for dimethylphthalate (C10H10O4) is –4685 kJ/mol. Assume 1.16  g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 7.85  kJ/°C at 20.0 °C. What is the final temperature of the calorimeter?

A sample of steam with a mass of 0.506 g at a temperature of 100 ∘C condenses into an insulated container holding 4.20 g of water at 3.0 ∘C . For water, ΔH∘vap=40.7kJ/mol and Cwater=4.18J/(g⋅∘C) .

Consider a balloon filled with 2115 L of helium at 1.00 atm pressure and 45.5°C. The temperature of the balloon is decreased to 26.3°C with the pressure remaining at 1.00 atm. What is ∆E (in kJ) for this change? (Assume ideal conditions. The molar heat capacity for He at constant pressure, Cp, is 20.8 J/°C･mol.)

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in humans. The value of ΔHcomb for dimethylphthalate (C10H10O4) is –4685 kJ/mol. Assume 1.01  g of dimethylphthalate is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 6.95  kJ/°C at 20.5 °C. What is the final temperature of the calorimeter?

I A sample of aluminum, which has a specific heat capacity of 0.897 J.g .°C is put into a calorimeter (see sketch at right) that contains 100.0 g of water. The aluminum sample starts off at 85.5 °C and the temperature of the water starts off at 16.0 °C. When the temperature of the water stops changing it's 23.3 °C. The pressure remains constant at 1 atm. Calculate the mass of the aluminum sample. Be sure your answer is rounded to the correct number of significant digits. thermometer. insulated container water sample a calorimeter