Asked by john
when 5g of impure sample of CH4 is completely combusted, 9g of H2O was produced.what is the percentage purity of the sample of CH4
Answers
Answered by
MathMate
Molecular mass of CH4=12+4=16
Molecular mass of H2O=16+2=18
Use the combustion equation:
CH4+2O2=CO2+2H2O
or 16 grams of CH4 should produce 2*18=36 grams of H2O.
If there are only 9g of H2O produced, use proportions to calculate the mass of CH4 that produced the H2O, and hence the percentage purity.
Molecular mass of H2O=16+2=18
Use the combustion equation:
CH4+2O2=CO2+2H2O
or 16 grams of CH4 should produce 2*18=36 grams of H2O.
If there are only 9g of H2O produced, use proportions to calculate the mass of CH4 that produced the H2O, and hence the percentage purity.
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