Write down the equation for the stoichiometric combustion of ethane (c2h6) with oxygen, and determine the stoichiometric air fuel mass ratio. atomic weights: h=1, c=12, o=16 (all kg/kmol), air composition: 23.3% oxygen, 76.7% nitrogen (by mass).

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.