Afuel gas containing 95 mole% methane and the balance ethane is burned completely with 25% excess air. the stack gas leaves the furnace at 900 degrees celsius and is cooled to 450 degrees celsius in a waste heat boiler, a heat exchanger in which heat lost by cooling gases is used to producde steam from liquid water for heating, power generation, or process applications.

a.) taking as a basis of calculation 100 mol of the fuel gas fed to the furnace, calculate the amount of heat (kj) that must be transferred from the gas in the waste heat boiler to accomplish the indicated cooling.
b.) how much saturated steam at 50 bar can be produced from boiler feedwater at 40 degrees celsius for the same basis of calculation? (assume all the heat transferred from the gas goes into the steam production.)
c.) at what rate (kmol/s) must fuel gas be burned to produce 1250 kg steam per hour (an amount required elsewhere in the plant) in the waste heat boiler? what is the volumetric flow rate (m3/s) of the gas leaving the boiler?
d.) briefly explain how the waste heat boiler contributes to the plant profitablility. (think about what would be required in its absense.)

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.