How Many Molecules Exist in a Cubic Centimeter at 10^-15 atm and 20°C?

Thread starter bse
Start date Feb 19, 2008
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Molecules Vacuum

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SUMMARY

The discussion focuses on calculating the number of molecules in one cubic centimeter at a pressure of 10^-15 atm and a temperature of 20°C using the ideal gas law equation PV = nRT. The variables include P for pressure, V for volume, T for absolute temperature, n for the number of moles, and R as the ideal gas constant. Participants emphasized the importance of using the correct units for R, which can be found in textbooks or online resources. The conclusion highlights that at such low pressure, the number of molecules is significantly reduced compared to standard atmospheric conditions.

PREREQUISITES

Understanding of the ideal gas law (PV = nRT)
Knowledge of units for pressure, volume, and temperature
Familiarity with the concept of moles in chemistry
Access to the ideal gas constant values

NEXT STEPS

Research the ideal gas constant (R) values in different units
Learn how to convert temperature from Celsius to Kelvin
Explore the implications of low-pressure environments on molecular behavior
Study the applications of the ideal gas law in real-world scenarios

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Chemistry students, physicists, and anyone interested in gas laws and molecular behavior under varying pressure and temperature conditions.

Feb 19, 2008

bse

How many molecules exist in one cubic centimeter of space at a pressure of 10^-15 atm and temperature of 20 degrees C?

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Feb 19, 2008

mgb_phys

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Homework Helper

PV = nRT
Where P pressure, V volume, T absolute temperature, n number of moles and R is a constant
You can find the units and value of R in the tetbook or wiki.