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Standard XII

Chemistry

Introduction

What is Δ U...

Question

What is $Δ U$ for the presence described by figure?
Heat supplied during the process, $q = 100 k J$ .

+ 50 k J

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- 50 k J

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- 150 k J

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+ 150 k J

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Solution

The correct option is A $+ 50 k J$
Given: Heat supplied, $Q = 100 K J$
Work done by the system $= \frac{1}{2} (b a s e \times h e i g h t)$

$\frac{1}{2} [2 - 1] m^{3} \times (1 - 2) b a r = \frac{- 1}{2} m^{3} . b a r$

$= \frac{- 1}{2} \times 100 k J = - 50 k J$

$Δ U = w + q = - 50 k J + 100 k J = 50 k J$

$Δ U = 50 k J$

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What is ΔU for the presence described by figure? Heat supplied during the process, q=100 kJ.

The correct option is A +50 kJGiven: Heat supplied, Q=100 KJ Work done by the system =12(base×height)12[2−1]m3×(1−2)bar=−12 m3.bar=−12×100 kJ=−50 kJΔU=w+q=−50 kJ+100 kJ=50 kJΔU=50 kJ

What is $Δ U$ for the presence described by figure?
Heat supplied during the process, $q = 100 k J$ .