問答題

寫出下列反應(yīng)的標(biāo)準(zhǔn)平衡常數(shù)表達(dá)式
(1)N2(g)+3H2(g)=2NH3(g)
(2)CH4(g)+2O2(g)=CO2(g)+2H2O(l)
(3)CaCO3(s)=CaO(s)+CO2(g)


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