Ammonia is not the only possible fertilizer. Others include urea, which can be produced by the reaction:

A scientist has 75 g of dry ice to provide the carbon dioxide. If 4.50 L of ammonia at 15°C and a pressure of 1.4 atm is added, which reactant is limiting? What mass of urea will form?

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CO,(g) + 2NH,(g)→CO(NH,)z(s) +H,O(g).