A salesperson comes to the door selling a service designed to check “chimney rot”. He explains that if the CO2 content of the gases leaving the chimney rises above 15%, it is dangerous to your health, is against the city code, and causes your chimney to rot. On checking the flue gas from the furnace, he finds it is 30% CO2. Suppose that you are burning natural gas which is about 100% CH4 and that the air supply is adjusted to provide 130% excess air. Do you need his service?

The vapour pressure of water P in mm Hg at t°C is given by the equation 1668.21 log10 PW = 7.96681 - t +228 A gaseous mixture at a total pressure of 1600 mm Hg and 100°C contains permanent gases and water vapour. The mole fraction of water vapour in the mixture is 0.12. The mixture is cooled at constant pressure. a) At what temperature will the first drops of condensed water appear? b) Using a basis of 100 kmol of initial mixture, how much water will be condensed when the temperature has reached 20°C?

The fraction recrystallized-time data for the recrystallization at 350°C of a previously deformed aluminum are tabulated here. Assuming that the kinetics of this process obey the Avrami relationship, determine the fraction recrystallized after a total time of 116.8 min. Assume y1 = 0.38 and y, = 0.73. Fraction Recrystallized Time (min) 95.2 126.6 i

Burning fossil fuels generates heat energy but also emits air pollution and generates greenhouse gases such as CO2 and N2O. The combustion of gigatons of fossil fuels over the last century has lead to the emission of so much greenhouse gas that we have changed the chemical composition of Earth's atmosphere. This chemical change in the atmosphere has enhanced the greenhouse effect leading to global warming and climate change today. Over 90% of the warming that has occurred on Earth in the last 60 years has occurred in the world's oceans. Most of the excess heat energy acquired by the oceans remains in the uppermost 700 m near the surface of the water, but almost 30% of the heat energy has conducted into the ocean depths. Measurements indicate that in the last 60 years of global warming the oceans have acquired an extra 228*1021J of heat energy. The ocean covers approximately 71% of Earth's surface, an area of 361*106km2 and has an average depth of the ocean is 3.682 km. The density of…