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Ammonia gas can be prepared by the reaction of a metal oxide such as calcium oxide with ammonium chloride.

CaO(s) + 2 NH4Cl(s) 2 NH3(g) + H2O(g) + CaCl2(s)
If 199 g of CaO and 300. g of NH4Cl are mixed, what mass of NH3can be produced?

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    change the masses to moles, and the mole ratio from the balanced equation (ratio of CaO to NH4Cl. Then what is the mole ratio of your masses? If it is greater than the coefficents, then CaO is in excess and wont react.

    I will be happy to check your work.

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