q4key - Chem 171 Quiz 4 Version A (Key Emp NIE) 1. The...

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Chem 171 Quiz 4 Version A (Key Emp NIE) 1. The molar mass of the compound with empirical formula P 2 O 5 is 284 g per mol. What is the molecular formula of the compound? (P = 30.97, O = 16.00) Empirical formula mass is (2 x 30.97) + (5 x 16.00) = 61.94 + 80.00 = 141.94 Ratio = 284 / 141.94 = 2 Molecular Formula = Emp Formula P 2 O 5 x 2 => P 4 O 10 2. Predict whether a reaction will occur in the following case. If there is a reaction, write the complete ionic equation, the net ionic equation and identify any spectator ions. KOH(aq) + MgCl 2 (aq) 2 K + (aq) + 2 OH - (aq) + Mg 2+ (aq) + 2 Cl - (aq) Mg(OH) 2 (s) + 2 K + (aq) + 2 Cl- (aq) (Complete Ionic Equation) 2 OH - (aq) + Mg 2+ (aq) Mg(OH) 2 (s) (Net Ionic Equation) K + and Cl - are spectator ions Chem 171 Quiz 4 Version B 1. A student precipitated 0.653 g of titanium (Molar mass = 47.88 g/mol) by reducing a solution containing 2.585 g of titanium chloride. What is the empirical formula of the chloride? Molar mass of Cl = 35.45 g/mol.
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This note was uploaded on 02/05/2012 for the course 160 171 taught by Professor Staff during the Spring '08 term at Rutgers.

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q4key - Chem 171 Quiz 4 Version A (Key Emp NIE) 1. The...

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