The empirical formula of a compound of phosphorus and oxygen was found to be P2O5 Experimentation s

The empirical formula of a compound of phosphorus and oxygen was found to be P2O5. Experimentation shows that the molar mass of this compound is 283.89 gmol. What is the compound's molecular formula Given Empirical formula P2O5 Molar mass 283.89 gmol Find Molecular formula Solution To find the compound's molecular formula, we need to determine the ratio between the empirical formula and the molecular formula. Step 1 Calculate the empirical formula mass. The empirical formula mass is the sum of the atomic masses of all the atoms in the empirical formula. Empirical formula mass of P2O5 = (2 atomic mass of P) + (5 atomic mass of O) Empirical formula mass of P2O5 = (2 30.97 gmol) + (5 16.00 gmol) Empirical formula mass of P2O5 = 61.94 gmol + 80.00 gmol Empirical formula mass of P2O5 = 141.94 gmol Step 2 Calculate the ratio between the empirical formula mass and the molar mass. Ratio = molar mass empirical formula mass Ratio = 283.89 gmol 141.94 gmol Ratio = 1.999 Step 3 Round the ratio to the nearest whole number. Rounded ratio = 2 Step 4 Multiply the subscripts in the empirical formula by the rounded ratio to get the molecular formula. Molecular formula = (P2O5)2 Molecular formula = P4O10 Therefore, the compound's molecular formula is P4O10.
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