a) for the mass of "p2O5" in the initial mass of fertilizer analyzed. 3. Experimentation shows that the molar mass of this compound is 283.89g/mol. Determine the molecular formula. 7. For each PO4 molecule there is 1 phosphorus (P) atom whereas for each P2O5 molecule, there are 2 phosphorus (P) atoms. The conversion factor from orthophosphate (PO4) to phosphorus pentoxide (P2O5) is 0.7473. P2O5's reaction with water causes the … 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). Its melting point is 2072 ̊C (3761. 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. 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. A common request on this site is to convert grams to moles. (atomic mass=30.97g/mol) and percentage P2O5(molar mass=141.95g/mol)in the sample. A compound containing carbon, hydrogen, and oxygen is found to be 40.00% carbon and 6.700% hydrogen by mass. Molecular mass compound = 283.89g/mol . You need 17.2 moles of p. Finding molar mass starts with units of grams per mole (g/mol). P2O5 has an apparent Mr (add up the Ar vaules) of 142. Molar Mass of P2O5 is 141.9445. apparently P2O5 was in the fertilizer... they reacted it with water : P2O5 & 3 H2O --> 2 H3PO4. so The molar mass of H 3 PO 4 is 98.00 g/mol. The compound has a molar mass of 283.88 g. What is the compounds molecular formula. 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. Formula:P2O5 Enter a chemical formula to calculate molar mass,The molar mass calculator can be used in Chemical industry and medicine industry. That is why it is called phosphorus anhydride at times. The molar mass of this compound is 232.41 g/mol. . Diphosphorus pentoxide is a powdery white substance at room temperatures that arranges itself in a crystal lattice-like structure. 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 M(O) = 15.999 g/mol. The empirical formula is OCNCl. 97 g/mol) 534 g Li 1 mol Li 6. 2. What is the compounds molecular formula? 1. Stoichiometry Calculations for Reactions in Solution. Calculation :-(molar mass of phosphorus)*2 + (molar mass of oxygen)*5 (30.9738)*2 + (15.9994)*5 = 61.9476 + 79.997 Please show how you did it. The Si/Al molar ratios of NaX zeolites were tested to be 1. 0 g 3 x O = 3 x 16. Update : Please Note that if in case the formal was given was wrong then probably our teacher made a … It reacts powerfully with water to form ortophosphoric acid, H3PO4. P4O10. To find the molar mass, find the atomic mass. Ratio = 283.89/142 = 2 . 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 Diphosphorus pentoxide is extremely hygroscopic and readily absorbs moisture and water vapor. Just want to know how i would go about this question, where would I start. This conversion is based on the molar mass ratio for the two compounds. 1 mole of P2O5 whose molar mass is 141.95 g/mol, with its 2 P's. 6. Divide original grams by molar mass to cancel out grams. 69) and Al2O3 (molar mass = 101. 2Al(OH)3 Al2O3 + 3H2O. so . Formula mass P2O5 = 31*2 + 16*5 = 142g/ formula . Structure. The mass of P2O5 formed is therefore 142/62 times the mass of P we started with. Molar mass of N2O5 = (2x14.007) + (5x15.999) = 28.014 + 79.995 = 108.009 g/mole. multiply by the constant avagadro's number which is a ratio of atoms to mol (to cancel out moles) Compare this with the manufacturer's specification. 0.400 g x (1 mol/141.94 g) x (6.022x10^23 atoms/ 1 mol) = approx. In a previous problem, the empirical formula of a compound of phosphorus and oxygen was found to be P2O5. Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of 78.110 g/mol. P2O5 is known as Phosphorus Pentoxide. Thus, the molar mass of diphosphorus pentoxide is M(P 4 O 10) = 30.973762(4) + 15.999(10) = 283.886 g/mol. 284/142 = 2, so the molecular formula is P4O10. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. produces 2 molar masses of MgNH4PO4*6H2O , whose molar mass is 241.40 g/mol. This comes out to 286.3g ... Molar mass of P2O5 is 142gmol-1. 1.7x10^21 atoms. P2O5, which has a molecular mass of 141.9, can usually be found as its dimeric, P4O10. A white powder is analyzed and found to have an empirical formula of P2O5. If a compound has an empirical formula of P2O5 and a molar mass of 283.88g/mol, what is its molecular formula? 8.311 g. @ (141.95 g/mol P2O5) / (482.80 grams for 2 moles MgNH4PO4*6H2O) = 2.4436 g P2O5. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.