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Calculate δHrxn for the following reaction: c(s)+h2o(g)→co(g)+h2(g)

7/23/2020

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One question that leads people to my website more often than any other ...

Question: Calculate δHrxn for the following reaction: c(s)+h2o(g)→co(g)+h2(g)

use the following reactions and given δh values:
c(s)+o2(g)→co2(g), δh= -393.5 kj
2co(g)+o2(g)→2co2(g), δh= -566.0 kj
2h2(g)+o2(g)→2h2o(g), δh= -483.6 kj

This is a classic Hess' Law question. Your job is to rearrange the three given reactions so that they add up to (and cancel to) the target reaction.

Keep Reaction 1 as is.
Reverse Reaction 2 and cut in half.
Reverse Reaction 3 and cut in half.

c(s)+o2(g)→co2(g), δh= -393.5 kj
co2(g)→co(g)+0.5 o2(g), δh= +283.0 kj

​h2o(g)→h2(g)+0.5 o2(g), δh= +241.8 kj
Added together:
c(s)+h2o(g)→co(g)+h2(g)
Total enthalpy: -393.5 + 283.0 + 241.8 = +131.3 kJ
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What is the hybridization of CH3F?

7/23/2020

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The hybridization the carbon atom in CH3F is sp3. We know this because of the tetrahedral arrangement of atoms around the carbon.

The fluorine atom is also sp3 hybridized. The single bond to carbon and the three lone pairs are four "electron groups" which are also tetrahedrally arranged around the F atom - but that is difficult to see from a Lewis structure.
Picture

Edit, in August 2020: I have decided to answer questions like this one on a new site, www.lewis-structure.com. This molecule in particular was made into my first post, which is at http://lewis-structure.com/ch3f-lewis-structure-and-ch3f-hybridization/ 
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Created by Nathan Oldridge (aka ChemistNATE).  All lessons here are Public Domain.