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28.09.2019 •
Chemistry
Do all liquids have the same freezing point?
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Ответ:
Ответ:
Ответ:
The volume of
required would be 
, assuming that both the pentane and the 
in this question are ideal gases and are under the same temperature and pressure.
Explanation:
Balance the equation for the reaction:
Start by setting the coefficient of the molecule with the largest number of atoms to
.
In the combustion of alkanes (including pentane,) consider setting the coefficient of the alkane to
.
Number of carbon atoms among the reactants:
.
Number of hydrogen atoms among the products:
.
By the conservation of atoms, there would need to be the same number of carbon and hydrogen atoms (along with the oxygen atoms) among the products.
Hence, the coefficient of
would be 
while the coefficient of 
would be 
.
There would be
oxygen atoms among the products. Also by the conservation of atoms, there would be the same number of oxygen atoms among the reactants.
Hence, the coefficient of
would be 
.
The ratio between the coefficient of
and 
in the balanced equation is:
In other words, it would take eight
molecules to react with one 
molecule.
Assume that both
and 
are ideal gases. Under the same temperature and pressure, the volume of the two gases would be proportional to the number of molecules in each gas:
In other words, it would take
of 
to react with 
of 
under these assumptions. It would then take 
of 
to react with 
of 
.