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The UA at one of the peer discussion sessions said that we most likely will not need to include the states of matter in the balanced equation. However, if all the states of matter for each reactant/product are given (either in an initial unbalanced equation or stated in the wording of the problem), then I think it would be best to include all the states of matter in your final balanced equation.
I don't think he ever mentioned knowing the states so I wouldn't be too worried about including them. Obviously if they're given in the unbalanced chemical equation you should keep it in your work, but in general I don't think we are writing our own chemical equations from the names of chemical compounds yet.
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