What mass of ammonium nitrate is require to produce 145L of N2O at 2850 torr and 42 degree celcius

Answer 1

Note the correct spelling of celsius.
NH4NO3 --->N2O + 2H2O
Use PV = nRT and solve for n = number mols N2O at the conditions listed.
Use the coefficients in the balanced equation to convert mols N2O from the previous calculation to mols NH4NO3.

Then convert mols NH4NO3 to grams. g = mols x molar mass.