Scelta multipla
The average atmospheric pressure in Denver is 0.830 atm. What is this pressure in kPa?
219
views
7. Gases
Pressure Units
Scelta multipla
Which value of the gas constant R should be used when pressure is given in atmospheres (atm)?
A
8.314 J·mol^{-1}·K^{-1}
B
62.4 L·mmHg·mol^{-1}·K^{-1}
C
1.987 cal·mol^{-1}·K^{-1}
D
0.0821 L·atm·mol^{-1}·K^{-1}
Guida verificata passo dopo passo1
Identify the units of pressure given in the problem, which is atmospheres (atm).
Recall that the gas constant R has different numerical values depending on the units used for pressure, volume, and energy.
Match the units of R to the units of pressure given. Since pressure is in atm, the value of R must include atm in its units.
Among the common values of R, the one with units L·atm·mol^{-1}·K^{-1} is appropriate when pressure is in atmospheres.
Therefore, the correct value of R to use when pressure is in atm is 0.0821 L·atm·mol^{-1}·K^{-1}.
Video correlati
Pratica correlata
