In: Chemistry
If at the beginning of the reaction you used 5.29 g N2 and 9.80 g O2, what is the theoretical yield (in grams) of N2O5 (you will need to find the limiting reagent and then the theoretical yield of N2O5from this reagent)?
The balanced reaction is
N2 + 2.5 O2 ------> N2O5
N2 moles = mass of N2 / molar mass of N2 = 5.29 g / 28 g/mol = 0.18893
O2 moles = 9.8 g / 32g/mol = 0.30625
as per reaction O2 moles needed = 2.5 x N2 moles = 2.5 x 0.18893 = 0.47
But we have only 0.30625 moles O2
Hence O2 being relatively less in moles is the limiting reagent
N2O5 moles produced = (1/2.5) x O2 moles = ( 1/2.5) x 0.30625 = 0.1225
N2O5 mass expected = N2O5 moles expected x molar mass of N2O5
= 0.1225 mol x 108 g/mol = 13.23 g
Thus theoretical yield of N2O5 = 13.23 g