Write the Equilibrium Expression for each of the three reactions below    1) CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)   2) HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)   3) 3CaCl2(aq) + 2Na2CO3(aq) → CaCO3(s) + 4NaCl(aq)

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