Can someone help with this question?

Melamine (C3N3(NH2)3) is a component of many adhesives and resins and is manufactured in a two-step process from urea (CO(NH2)2) as the sole starting material. How many moles of urea would be required if we want to collect 1.00 kg of melamine and if the first step in the process is 100% yield, but the second step is only 65% yield? (1) CO(NH2)2 (l)  HNCO(l) + NH3(g) (balanced) (2) HNCO(l)  C3N3(NH2)3 (l) + CO2(g) (unbalanced)

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