November 28, 2015

Homework Help: chemistry

Posted by Will on Tuesday, October 13, 2009 at 8:55pm.

Could someone please tell me if I did this question correctly?

An incomplete combustion reaction of 12.125 grams of propane proceeds as follows: 2C3H8 + 11O2 = 3CO2 + 4H2O + 2CO + C(s).How many grams of solid carbon residue are produced as a product?

my answer:

molar mass of propane=48.91g/mol
molar mass of carbon= 12.01g/mol

Step 1)
The balanced chemical equation for "2C3H8 + 11O2 = 3CO2+ 4H2O + 2CO + C"
is "7C3H8 + 22O2 = 6CO + 284H2O + 4CO + 11C."

Step 2)
Convert 12.125 grams of propane to moles.


step 3)
The ratio of propane to carbon dioxide is 7:11(or 1 to 1.5714). Therefore, for every mole of propane there will be 1.5714mol of carbon.

1.5714(.2479mol)=.3896mol of carbon.

step 4)
Convert back to grams.
.3896mol( 12.01g/mol)
= 4.679g

In the given reaction, 4.679g of solid carbon will be produced.

Thanks for your help.

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