The value of $Δ E$ when $1500 c a l$ of heat is added to the system while the system does work equivalent to $2500 c a l$ by expanding against the surrounding atmosphere is:

4000 c a l

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1000 c a l

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- 1000 c a l

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- 4000 c a l

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Solution

The correct option is D $- 1000 c a l$
$q = + 1500$ $c a l$ (Heat is added to the system)
$W = - 2500$ $c a l$ (Work is done on surrounding)
$Δ U = q + W$
$⟹ Δ U = + 1500 - 2500$
$⟹ Δ U = - 1000$ $c a l$

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The value of ΔE when 1500cal of heat is added to the system while the system does work equivalent to 2500cal by expanding against the surrounding atmosphere is:

The correct option is D −1000calq=+1500 cal (Heat is added to the system)W=−2500 cal (Work is done on surrounding)ΔU=q+W⟹ΔU=+1500−2500⟹ΔU=−1000 cal

The value of $Δ E$ when $1500 c a l$ of heat is added to the system while the system does work equivalent to $2500 c a l$ by expanding against the surrounding atmosphere is:

The correct option is D $- 1000 c a l$
$q = + 1500$ $c a l$ (Heat is added to the system)
$W = - 2500$ $c a l$ (Work is done on surrounding)
$Δ U = q + W$
$⟹ Δ U = + 1500 - 2500$
$⟹ Δ U = - 1000$ $c a l$