A mixture of propane and butane is burned with air. Partial analysis of the stack gas produces the following dry-basis volume percentages: 0.0527% C3H8 , 0.0527% C4H10, 1.48% CO, and 7.12% CO2. The stack gas is at an absolute pressure of 780 mm Hg and the dew point of the gas is 46.5°C. Calculate the molar composition of the fuel.

2. Fruit is impeded from ripening when it reaches high temperatures (>32°C). Farmer Joe is roo worried that Princeton's summer heat wave will affect the ripening of his ground cherries. The spherical fruit (1 cm in diameter) is surrounded by a spherical papery husk (husk = 0.3 W/m K) with an inner diameter of 2 cm and an outer diameter of 2.1 cm. The air in between the fruit and the husk is stagnant (air = 0.03 W/m K). On a calm day in July, the Princeton air (outside of the husk) is very warm, with a temperature of ~38°C and a heat transfer coefficient of hPrinceton,calm = 10 W/m².K. (a) Sketch the system, labeling all temperatures, dimensions, and proportionality constants.

A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods.

43. A liquid is observed to boil at 120°C under a pressure of 725 mm. Its molar heat of vaporization is 8200 cal/mole. Calculate the normal boiling point of the liquid.