Of each of these equations, determine the change in the number of moles (change in n gas)
(a) (NH4)2CO3(s) yields 2NH3 (g) + CO2 (g) + H2O (g) ___________ mol
(b) H2 (g) + Cl2 (g) yields @HCl (g) ___________ mol
(c) 2H2 (g) + O2 (g) yields 2H2O (l) ___________ mol
(d) 2Na (s) + Cl2 (g) yields 2NaCl (s) ___________ mol
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