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Thermodynamic Systems

A mole of gas has isobaric expansion coefficient dV/dT = R/p and isochoric pressure-temperature coefficient dp/dT = p/T . Find the equation of state of the gas.

User Balupton
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Final answer:

By integrating the isobaric expansion coefficient and the isochoric pressure-temperature coefficient for the gas, and considering the conditions when T = T0, V = V0, and p = p0, we derive the ideal gas law (pV = RT) as the equation of state for the gas.

Step-by-step explanation:

We are tasked with finding the equation of state for a gas given the isobaric expansion coefficient (dV/dT = R/p) and the isochoric pressure-temperature coefficient (dp/dT = p/T). To find the equation of state, we integrate each of these coefficients. The isobaric expansion coefficient implies:

dV = (R/p) dT,

which upon integrating at constant pressure (p) gives us:

V = (R/p) T + V0,

where V0 is the integration constant, which can be interpreted as the volume when the temperature is absolute zero.

Similarly, integrating the isochoric pressure-temperature coefficient at constant volume (V) gives:

p = (p0/T0) T,

where p0 is the pressure at a reference temperature T0.

Combining the two relationships and eliminating the integration constants by considering that when T = T0, V = V0 and p = p0, we obtain the ideal gas law:

pV = RT,

which is the sought equation of state for the gas under consideration.

User TrapezeArtist
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