Your answer would be correct if you had used the correct number for n, the number of mols.
mols NO = 30/50 = 1.67
Now convert mols NO to mols O2 using the coefficients in the balanced chemical equation.
mols O2 = 1.67 mols NO x (5 mols O2/4 mols NO) = 2.08 mols O2.
Substitute 2.08 for mols O2 and you will have the correct answer.
Nitric Acid is produced from nitric oxide, NO which in turn is prepared from ammonia by the ostwald process.
4NH3 + 5O2 -----> 4NO + 6H2O
What volume of oxygen at 35 degrees C and 2.15 atm is neeeded to produce 50.0 g of nitric oxide
T= 273+35 = 308 K
P = 2.15 atm
n= 50.0 g ( 1 mol/ 30 g)= 1.667 mol
R= 0.0821
V= ?
2.15 (V) = 1.67(.0821)(308)
ANSWER:
V= 19.64
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