Question

In which of the following chemical changes work is done on the system
1.3H2(g)+N2(g)=2NH3
2.CH4(g)+2o2(g)=CO2(g)+2H20
3.CaCo3(s)=Cao(s)+CO2(g)
4.C(s)+CO2(g)=2Co2
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Answer 1

Explanation:

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