How do you balance the following chemical equations by adding coefficients?

Question

#HCI -> H_2O + NaCI#
#Fe_2O_3 + C -> Fe+ CO_2#
SO_2 + O_2 -> SO_3#

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Answer 1 · 2016-04-27T16:42:09

You do so stoichiometrically. Garbage out must equal garbage in.

#HCl(aq) + NaOH(aq) rarr NaCl(aq) + H_2O(l)#
(I am guessing that this is the equation you mean.)

#2Fe_2O_3(s) + 3C(s) rarr 4Fe(l) + 3CO_2(g)#
(This is the reaction that would take place in an iron foundry.)

#SO_2(g) + 1/2O_2 rarr SO_3(g)#
(You can double this equation if you dislike the fractional coefficient.)

Are all equations stoichiometrically balanced? If not, they should be.