CO2 and NH3 combines together to form CH4N2O and H20. What is the mass of NH3 that would be needed to make 2 moles of CH4N2O. Balanced equation is

CO2+2NH3-->CH4N2O+H2O

You have the balanced equation.

Use the coefficients in the balanced equation to convert mols CH4N2O to mols NH3.
Then g NH3 = mols x molar mass.