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Why is the wo...

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Why is the work done by gas when it expands negative? Work done is pressure * change in volume. Since final volume is larger than initial volume, it should be positive na?

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Q. Work done on the gas, W, in an irreversible expansion is given by

W = - P_{e x t} \times d V

P_{e x t}

is the external pressure and dV is the change in volume of the gas (i.e.,

V_{f i n a l} - V_{i n i t i a l}

). What is the value of work done on 1 mole of an ideal gas when it expands into vaccum?

Q. Find the work done by a gas when it expands isothermally at

37^{o}

to four times its initial volume:

Q. Find the work done by a gas when it expands isothermally at

37^{o} C

to four times its initial volume.

Q. Assertion :In a thermodynamic process, initial volume of gas is equal to final volume of gas. Work done by gas in this process should be zero. Reason: Work done by gas in isochoric process is zero.

Q. Find the work done by a gas when it expands isothermally at

37^{\circ} C

to four times its initial volume.

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