Why this chemical equation 3p4 + 10o2 = 4p2o5 + p4 is wrong?

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2