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Determining a Molecular Formula from an Empirical Formula

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Rosa Sanchez

on 23 February 2013

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Transcript of Determining a Molecular Formula from an Empirical Formula

Rosa Sanchez
Chemistry Honors
Period 7 Determining a Molecular Formula from an Empirical Formula Question The empirical formula for a compound is P2O5. Its experimental molar mass is 284g/mol. Determine the molecular formula of the compound Step 1: Gather Information Step 2: Plan your work Find the molar mass of the empirical formula using the molar masses of elements from the periodic table Step 3a: Calculate Molecular formula= P4O10 empirical formula= P2O5
molar mass of compound = 284g/ mol
molecular formula= ? molar mass of P= 30.97g/mol
molar mass of O= 16.00g/mol Find the molar mass of the empirical formula , P2O5 2 x molar mass of P= 61.94g/mol
+
5 x molar mass of O= 80.00g/mol Molar mass of P2O5= 141.94g/mol Answer Step 3b solve for n, the factor multiplying the empirical formula to get the molecular formula n= experimental molar mass of a compound fffffmolar mass of empirical formula Step 3c Substitute the molar masses into this equation, and solve for n n= 284g/mol
141.94g/mol = 2.00= 2 Step 3d Multiply the empirical formula by n to get answer n(empirical formula)= 2(P2O5)= P4O10
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