From the equation, 124g of P produced 284g of P2O5. 8.311 g. @ (141.95 g/mol P2O5) / (482.80 grams for 2 moles MgNH4PO4*6H2O) = 2.4436 g P2O5. P2O5 is Phosphorous pentoxide. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Molar Mass of P = 31g/mol. That is why it is called phosphorus anhydride at times. 284 / 141.94 = so. determine the molecular compound molar mass of P X 2. molar mass of O X 5. Phosphorous acid is H3PO3. The guarantee is expressed as phosphate (P2O5). % / molar mass. P2O5, which has a molecular mass of 141.9, can usually be found as its dimeric, P4O10. Mass of P2O5 from the equation = 2 x 142 = 284g. The molecular mass of P is 30.97, and that of O is 16. Linear Formula P 2 O 5. 98.25 g/mol 108.0 g/mol 219.9 g/mol O 141.9 g/mol 46.97 g/mol Get more help from Chegg Get 1:1 help now from expert Chemistry tutors a) for the mass of "p2O5" in the initial mass of fertilizer analyzed. 1.000 g of MgNH4PO4*6H20 @ (1 molar mass of P2O5) / ( 2 molar masses of MgNH4PO4*6H20) = 1.000 g MgNH4PO4*6H20 @ (141.9 g/molP2O5) / (2)(245.41 g/mol MgNH4PO4*6H20) = 0.2891 grams of P2O5 It reacts powerfully with water to form ortophosphoric acid, H3PO4. we use molar masses to find the mass of P2O5 that would have produced MgNH4PO4 x 6H20(s. it takes 1 P2O5 to have enough P's to make 2 MgNH4PO4 x 6H20. Now we can obtain the theoretical yield of P2O5 as follows: 4P + 5O2 → 2P2O5. Molar Mass of P2O5 = (31x2) + (16x5) = 62 + 80 = 142g/mol. We need to find out how much P is in P2O5. its experimental molar mass is 284 g/mol. produces 2 molar masses of MgNH4PO4*6H2O , whose molar mass is 241.40 g/mol. The relative molecular mass of phosphorous is 31 and of oxygen is 16. mass of 1 mol of P2O5 =(31x2)+(16x5) The next step shows you that P2O5 is 43.7% P. Atomic weight: P = 31 O = 16 P 2: two of them so 2 X 31 = 62g O 5: five of them so 5 X 16 = 80g Total weight for P 2 O 5 142g The proportion of P in P 2 O 5 is [62 / 142] = 0.437 Now we can calculate elemental P. P2O5's reaction with water causes the … 1 mole of P2O5 whose molar mass is 141.95 g/mol, with its 2 P's. So in your formula of P2O5, the total mass is 2 x 31 + 5 x 16 = 142 (I've rounded off). No of moles=given mass÷molar mass 0.0250=given mass÷31×2+16×5 Given mass=142×0.025 Hence mass of 0.025 moles of P2O5 is 3.55g = 141.94. O peso molecular e massa molar de P2O5 é 141,945. And this is indeed the case. so . What is the molar mass of P2O5? See the link below. Mass of P from the equation = 4x31 = 124g. 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