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Help on Chem with gas laws and molecular formula?
for the record i did not put this off. this is one of the 3 questions on the whole 30 question assignment that i couldn't figure out...
anyway...
A sample of a liquid hydrocarbon known to consist of molecules with five carbon atoms is vaporized in a 0.204 - L flask by immersion in a water bath at 101 C. the barometric pressure is 767 torr, nd the remaining gas weighs 0.482g. What is the molecular formula of the hydrocarbon?
the answer in the back of the book is: C5H12
can you please explain to me how to get that answer?
2 Answers
- redbeardthegiantLv 71 decade agoFavorite Answer
Use PV = nRT to find the number of moles in the flask.
Since you know the mass in the flask, you can find the molecular weight.
Since you know the compound has 5 carbons, the rest of the mass must be from hydrogens. Looks like the MW came out to 72.
- lainLv 44 years ago
i don't think Jason's answer is right. he's right which you have 0.0144 moles of NO2 yet you are able to not derive a chemical formula in basic terms given which you comprehend what proportion moles of the substance is interior the field. perhaps you have 0.0144 moles of NO2 or 0.0144 moles of N2O4. you nevertheless do not comprehend. i don't think of you have adequate information to sparkling up your subject.
