LinkExchange Member

Free Home Pages at GeoCities

Flamethrower

After learning that any attempt to kill the alien in a way that spilled blood would mean disaster for the Nostromo, the crew decided to try to force the alien into an airlock, using flamethrowers to frighten it.

Propane, C₃H₈, is a typical flamethrower fuel.

Balance the equation for the combustion of propane.

Calculate the molar enthalpy for the reaction.

The combustion of a hydrocarbon yields water and carbon dioxide:

a C₃H₈(g) + b O₂(g) --> c CO₂(g) + d H₂O(g)

1 C₃H₈(g) + 5 O₂(g) --> 3 CO₂(g) + 4 H₂O(g)

Substance	Delta Hfo (KJ mol-1) at 25 C
C3H8(n-propane)	-103.8
O2(g)	0
CO2(g)	-393.5
H2O(g)	-241.8

The enthalpy change for a reaction is the standard enthalpies of formation for the products, minus the standard enthalpies of formation for the reactants.

[(3)(-393.5) + (4)(-241.8)] - [(1)(-103.8) + (5)(0)]

[(-1180.5) + (-967.2)] - [(-103.8) + 0]

-2043.9 KJ mol^-1




Next Page

Return to Master Alchemist Index



Last Revised 02/03/98.
Copyright ©1998 by William L. Dechent. All rights reserved.