Apower plant burns 900kg of coal per hour and produces 480kw of power. if each kg of coal releases 5,9mj, determine the efficiency of the plant
b)air enters the nozzles at 3,0 bar, 1270c and 30m/s. during its passages a heat loss of 4,40kj/kg and the fluid leaves at 2,0 bar and 270m/s. the heat loss to environment ioccurs at 270c. calculate the final temperature, the entropy change of air and the total entropy change of the overall process, is the process reversible, irrevessible or impossible?

  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 minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

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