A pilot with two passengers on board landed on a 2,100 foot east-west gravel strip having an elevation of 1,800 feet. The temperature is warmer than expected and after computing the density altitude, the pilot determined the takeoff distance over a 50 foot obstacle to be 1,980 feet. The airplane is 75 pounds under gross weight. What would be the best choice?

A. Go for the flight as there is a leeway of 120 feet for takeoff
B. Have the pilot take off by himself and see how the takeoff performance was without the weight of the passengers.
C. Call the tower and see if anyone else has reported climb-out performance problems
D. Postpone the flight and wait for cooler temperatures to recalculate takeoff performance

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas