Question

Heat of combustion of CH4, C2, C2H6. are - 890, -1411 and -1560 kl/mol respectively. Which has the lowest calorific fuel value in kJ/g?

Answer 1

Answer:

The combustion reactions are as shown.

C+O

2

→CO

2

ΔH

1

=−393.5kJ/mol

CO+0.5O

2

→CO

2

ΔH

2

=−283.5kJ/mol

C+0.5O

2

→COΔH

3

ΔH

3

=ΔH

1

−ΔH

2

ΔH

3

=−393.5kJ/mol−(−283.5kJ/mol)=−110kJ/mol

Answer 2

__________________________

●Calorific value = heat of combustion per g of fuel.

●For C2H4,it is - 141128,the lowest value.

__________________________

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