16 CYL
Question
A 0.00215g sample of polystyrene, a polymer composed of carbon and hydrogen, produced 0.00726g of CO2 0.00148g of H2O in combustion analysis. What is the empirical formula for polystyrene?
Step-by-Step Solution
Verified Answer
- CH is the empirical formula for polystyrene.
1Calculating number of carbon moles
To calculate this we use the produced mass from the question
Moles= 0.00726g/44g= 1.65 x 10-4 mol CO2
So moles of carbon will also be 1.65 x 10-4 mol
2Calculating moles of water
Moles=0.00148g/18g= 8.22 x 10-5 mol H2O
In water, the mo les of “H” are double the moles of water
So moles of H = 1.64 x 10-4 mol
The number of moles of C and H is the same so, the empirical formula is CH.
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