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It could be the limiting reactant, however, just because the other reactant's grams aren't specified does not mean it isn't. While both can't be limiting, there may be more information in the problem for you to be able to solve the mass of the other reactant, such as a given amount of moles.
It is not safe to say because there is a possibility that it could be the other reactant. After identifying the reactants and balancing the chemical equation, you should calculate the molar mass of the reactants and products and convert it into moles. Then to compare the calculated moles to the required moles in the balanced reaction to determine if your inference about the reactant with listed grams is indeed the limiting reactant.
I wouldn't necessarily say that you can assume that the one reactant would be the limiting reactant because there could be additional details in the problem that would say otherwise. However, you could assume that if all other reactants were in "excess", then the one reactant would be considered the limiting reactant.
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