A diesel engine draws in air at the inlet at 95kPa pressure, 300K temperature. The engine has a compression ratio of 20:1. The heat released during combustion is 1300 kJ/kg. Using the cold air standard assumptions, please calculate: a) The temperature after combustion.
b) The cycle efficiency
c) The mean effective pressure for the cycle
d) The cutoff ratio for the cycle

8 carbon atoms forming single bonds with 18 hydrogen atoms; a triple bond exists between the third and fourth carbon atom from the right

explanation:

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2