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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: kenny122 on November 26, 2007, 02:54:15 PM

Title: adding equations
Post by: kenny122 on November 26, 2007, 02:54:15 PM

i need to add the following equations, and cannot for the life of me get it.

1) Fe+3HCL=FeCl3+3/2H2

2)Fe2O3+6HCL=2FeCl3+3H2O

3)2H2+02=2H2O

Title: Re: adding equations
Post by: AWK on November 27, 2007, 01:26:10 AM

Why for?

Title: Re: adding equations
Post by: kenny122 on November 27, 2007, 02:25:52 PM

i am supposed to add the equations to give the final equation for the combustion of iron, and then add the heats of reactions, which i already have.

Title: Re: adding equations
Post by: AWK on November 28, 2007, 01:17:56 AM

Fe + O2 = Fe2O3 ?
Then multiply eq. 1 by 4, eq.2 by 2 and change sides, eq. 3 by 3, and finally add all equations