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Which of the following chemical and physical processes result in work being done by the system on the surroundings?

Assume that all take place at constant pressure.

A

${ H }_{ 2 }O(g)\rightarrow { H }_{ 2 }O(l)$

B

${ H }_{ 2 }(g)+{ Cl }_{ 2 }(g)\rightarrow { 2HCl(g) }$

C

$CaC{ O }_{ 3 }(s)\rightarrow CaO(s)+{ CO }_{ 2 }(g)$

D

$2{ H }_{ 2 }(g)+{ O }_{ 2 }(g)\rightarrow 2{ H }_{ 2 }O(l)$

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