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Standard XII

Chemistry

Introduction

A certain mas...

Question

A certain mass of gas is taken from an initial thermodynamic state A to another state B by process I and II. In process I the gas does 5 joules of work and absorbs 4 joules of heat energy. In process II, the gas absorbs 5 joules of heat. The work done by the gas in process II (see figure) is

+6 joules

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-6 joules

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+4 joules

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-4 joules

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Solution

The correct option is A +6 joules
Internal energy doesnt depend on path.
$∴ Q = U + W$
in path $I$
$Q = u, w = + 5$
$U = - 1 J$
in path $I I$
$Q = 5, U = - 1$
$∴ W = 5 - (- 1) = 6 J$

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A certain mass of gas is taken from an initial thermodynamic state A to another state B by process I and II. In process I the gas does 5 joules of work and absorbs 4 joules of heat energy. In process II, the gas absorbs 5 joules of heat. The work done by the gas in process II (see figure) is

The correct option is A +6 joulesInternal energy doesnt depend on path.∴Q=U+Win path IQ=u,w=+5U=−1 Jin path IIQ=5,U=−1∴W=5−(−1)=6 J

The correct option is A +6 joules
Internal energy doesnt depend on path.
$∴ Q = U + W$
in path $I$
$Q = u, w = + 5$
$U = - 1 J$
in path $I I$
$Q = 5, U = - 1$
$∴ W = 5 - (- 1) = 6 J$