Respuesta :
Answer:
Energy content per mol fuel 1257 kJ.
Energy content per gram fuel = 27.33 kJ
Energy released per mol carbon dioxide gas formed is 628.5 kJ
Energy released per mol oxygen gas consumed= 419 kJ
Moles of carbon dioxide gas formed per 1000 kJ energy released is 1.591.
Explanation:
[tex]C_2H_5OH+3O_2\rightarrow 2CO_2 + 3H_2O,\Delta H= 1257 kJ/mol[/tex]
1) Energy released per mole or fuel that is ethanol :
[tex]1mol \times 1257 kJ/mol=1257 kJ[/tex]
2) Mass of 1 mole of ethanol = 46 g
46 grams of ethanol produces 1257 kJ of energy
Energy content per gram fuel :
[tex]\frac{1257 kJ}{46 g}=27.33 kJ/g[/tex]
3) Energy released when 2 moles of carbon dioxide are formed = 1257 kJ
Energy released per mol of carbon dioxide formed:
[tex]\frac{1}{2}\times 1257 kJ/mol=628.5 kJ/mol[/tex]
4) Energy released when 3 moles of oxygen gas are consumed = 1257 kJ
Energy released per mol of oxygen gas consumed:
[tex]\frac{1}{3}\times 1257 kJ/mol=419 kJ/mol[/tex]
5) Energy released when 2 moles of carbon dioxide are formed = 1257 kJ
Moles of carbon dioxide gas formed per kilo Joule of energy:
[tex]\frac{2}{1257} mol[/tex]
Moles of carbon dioxide gas formed when 1000 kJ of heat is released:
[tex]\frac{2}{1257} \times 1000 mol=1.591 mol[/tex]
