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krazziekidd2p845ri
27.08.2020 •
Physics
As you did above for the gas, now estimate the number of molecules found in a cubic centimeter of a liquid at ordinary pressure and temperature.
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Ответ:
There are
molecules in a cubic centimeter of water at ordinary pressure and temperature.
Explanation:
Let suppose that liquid is water at a pressure of a atmosphere and a temperature of 25 ºC. Due to incompresibility of liquids, water density does not have any change of importance due to changes in pressure and temperature.
Density and molar mass of water are 1 gram per cubic centimeter and 18.015 grams per mole. The mass of water in a cubic centimeter (
), measured in grams, is:
Where:
Given that
and
, the mass of water is:
The amount of moles (
) inside the sample is:
Where:
If
and
, then:
According to the Avogadro's Principle, there are
molecules per mole. Hence, the number of molecules in a cubic centimeter of water at ordinary pressure and temperature is determined by simple rule of three:
There are
molecules in a cubic centimeter of water at ordinary pressure and temperature.
Ответ:
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