Chemistry

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They are all balanced ok, the main difficulty that I have is the second. Sulfur dioxide is highly soluble in water, most folks would have written the products as sodium chloride and sulfurous acid H2SO3, or as a minimum changed the gas to (aq) on the SO2.

The balancing is correct in any case.

Do I have these equations right?

2NaOH(aq) + 2Al(s) + 2H20(l) --> 2NaAlO2(aq) + 3H2(g)

2HCl(aq) + Na2SO3 --> 2NaCl(aq) + SO2(g) + H2O(l)

H2SO4(aq) + CuS(s) --> CuSO4(aq) + H2S(aq)

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