4C3H5N3O9 -> 6N2 + 12CO2 + 10H2O + O2
This is not balanced! Now it is! Don't forget all coefficients again!
2 X 10^2 grams Nitro (1 mole Nitro/227.1 grams)(1 mole O2/4 mole Nitro)(6.022 X 10^23/1 mole O2)
= 1.33 X 10^23 molecules O2
------
1.33 X 10^23 molecules O2 (1 mole O2/6.022 X 10^23)(32.0 grams/1 mole O2)
= 7.05 gram
------
6,55 grams/7.05 grams
92.9% is the yield
------
I see you have a lot of problems. If you do not try to work some yourself you will fail chemistry. Chemistry is in the doing.
This is not balanced! Now it is! Don't forget all coefficients again!
2 X 10^2 grams Nitro (1 mole Nitro/227.1 grams)(1 mole O2/4 mole Nitro)(6.022 X 10^23/1 mole O2)
= 1.33 X 10^23 molecules O2
------
1.33 X 10^23 molecules O2 (1 mole O2/6.022 X 10^23)(32.0 grams/1 mole O2)
= 7.05 gram
------
6,55 grams/7.05 grams
92.9% is the yield
------
I see you have a lot of problems. If you do not try to work some yourself you will fail chemistry. Chemistry is in the doing.