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    When writing chemical equations, how can you be sure of the states of the

    chemicals involved.? Ok, so I'm new to this. lol. In equations like, 2HCl + MgO ----> MgCI2 + H2O, I know that the state of water in (l), and the state of HCl is (aq), but what about MgO and MgCl2? Do we just have to memorize the states or is there some way of knowing? I need to know, because...
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