P2O5, which has a molecular mass of 141.9, can usually be found as its dimeric, P4O10. (atomic mass=30.97g/mol) and percentage P2O5(molar mass=141.95g/mol)in the sample. A white powder is analyzed and found to have an empirical formula of P2O5. so 1.7x10^21 atoms. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Formula:P2O5 Enter a chemical formula to calculate molar mass,The molar mass calculator can be used in Chemical industry and medicine industry. P2O5 is known as Phosphorus Pentoxide. The mass of P2O5 formed is therefore 142/62 times the mass of P we started with. P4O10. 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 The molar mass of this compound is 232.41 g/mol. From your mass of MgNH4PO4.6H2O collected, calculate your value a) for the mass of "P2O5" in the initial mass of fertilizer analyzed b) the % "P2O5" in the fertilizer. 0 g 3 x O = 3 x 16. 8.311 g. @ (141.95 g/mol P2O5) / (482.80 grams for 2 moles MgNH4PO4*6H2O) = 2.4436 g P2O5. 0.400 g x (1 mol/141.94 g) x (6.022x10^23 atoms/ 1 mol) = approx. Finding molar mass starts with units of grams per mole (g/mol). Compare this with the manufacturer's specification. multiply by the constant avagadro's number which is a ratio of atoms to mol (to cancel out moles) P2O5 has an apparent Mr (add up the Ar vaules) of 142. Divide original grams by molar mass to cancel out grams. A common request on this site is to convert grams to moles. a) for the mass of "p2O5" in the initial mass of fertilizer analyzed. The Si/Al molar ratios of NaX zeolites were tested to be 1. Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of 78.110 g/mol. Its melting point is 2072 ̊C (3761. You need 17.2 moles of p. It reacts powerfully with water to form ortophosphoric acid, H3PO4. apparently P2O5 was in the fertilizer... they reacted it with water : P2O5 & 3 H2O --> 2 H3PO4. Ratio = 283.89/142 = 2 . What is the compounds molecular formula? Phosphorus pentoxide crystallizes in at least four forms or polymorphs.The most familiar one, a metastable form (shown in the figure), comprises molecules of P 4 O 10.Weak van der Waals forces hold these molecules together in a hexagonal lattice (However, in spite of the high symmetry of the molecules, the crystal packing is not a close packing). then reacted it with NH4OH & Mg+2 , precipitating it as MgNH4PO4 x 6H20(s. 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. For each PO4 molecule there is 1 phosphorus (P) atom whereas for each P2O5 molecule, there are 2 phosphorus (P) atoms. This comes out to 286.3g ... Molar mass of P2O5 is 142gmol-1. 1. 2Al(OH)3 Al2O3 + 3H2O. Molecular formula = ( P2O5) ... Take the decimal equivalent of the percentages and multiply that by the molar mass determined in the mass spectrophotometer. The three hydrogen atoms contribute a molar mass of: 3(1.01 g/mol) = 3.03 g/mol One phosphorus atom... See full answer below. Thus, the molar mass of diphosphorus pentoxide is M(P 4 O 10) = 30.973762(4) + 15.999(10) = 283.886 g/mol. so . This conversion is based on the molar mass ratio for the two compounds. Diphosphorus pentoxide is a powdery white substance at room temperatures that arranges itself in a crystal lattice-like structure. 1 mole of P2O5 whose molar mass is 141.95 g/mol, with its 2 P's. 69) and Al2O3 (molar mass = 101. Just want to know how i would go about this question, where would I start. The conversion factor from orthophosphate (PO4) to phosphorus pentoxide (P2O5) is 0.7473. 3. Update : Please Note that if in case the formal was given was wrong then probably our teacher made a … M(O) = 15.999 g/mol. 2. 97 g/mol) 534 g Li 1 mol Li 6. produces 2 molar masses of MgNH4PO4*6H2O , whose molar mass is 241.40 g/mol. If a compound has an empirical formula of P2O5 and a molar mass of 283.88g/mol, what is its molecular formula? The empirical formula is OCNCl. . Molar mass of N2O5 = (2x14.007) + (5x15.999) = 28.014 + 79.995 = 108.009 g/mole. 284/142 = 2, so the molecular formula is P4O10. Molecular mass compound = 283.89g/mol . To find the molar mass, find the atomic mass. Structure. Determine the molecular formula. 6. Please show how you did it. Experimentation shows that the molar mass of this compound is 283.89g/mol. Calculation :-(molar mass of phosphorus)*2 + (molar mass of oxygen)*5 (30.9738)*2 + (15.9994)*5 = 61.9476 + 79.997 The molar mass of H 3 PO 4 is 98.00 g/mol. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Diphosphorus pentoxide is extremely hygroscopic and readily absorbs moisture and water vapor. The compound has a molar mass of 283.88 g. What is the compounds molecular formula. That is why it is called phosphorus anhydride at times. A compound containing carbon, hydrogen, and oxygen is found to be 40.00% carbon and 6.700% hydrogen by mass. In a previous problem, the empirical formula of a compound of phosphorus and oxygen was found to be P2O5. Stoichiometry Calculations for Reactions in Solution. P2O5's reaction with water causes the … Formula mass P2O5 = 31*2 + 16*5 = 142g/ formula . Molar Mass of P2O5 is 141.9445. 7. molar mass of P2O5 = 142 g/mol Noe we will find the moles of 0.560 g P2O5: moles = mass / molar mass moles = 0.560 g / 142 g/mol moles = 0.0039 mol now we will find the atoms present in 0.0039 moles: 0.0039 * 6.02 * 10∧ 23 molecules 2.357 * 10∧ 21 molecules P2O5 consist of 7 atoms: 2.357 * 10∧ 21 * 7 = 16.499 * 10∧ 21 atoms Fertilizer analyzed ( 2x14.007 ) + ( 5x15.999 ) = 2.4436 g P2O5 6.700 % by. Based on the molar mass of `` P2O5 '' in the sample `` P2O5 '' in the sample in previous! In the initial mass of this compound is 232.41 g/mol moles MgNH4PO4 * 6H2O, whose molar mass of =. You need 17.2 moles of p. p2o5 molar mass is known as phosphorus pentoxide go about question! % hydrogen by mass units of all the atoms in a previous problem, the formula! It is called phosphorus anhydride at times by mass that substance of fertilizer analyzed to moles 286.3g... mass... 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