Molar_Ratios_and_Mass_Relationships_in_Chemical_Equations

Molar_Ratios_and_Mass_Relationships_in_Chemical_Equations -...

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Unformatted text preview: Molar Ratios and Mass Relationships in Chemical Equations This handout demonstrates how to solve a typical stoichiometry problem involving mass relationships and molar ratios. Problem #1: Given this reaction answer the following questions. CaCl 2 ( aq ) + Na 2 C 2 O 4 ( aq ) CaC 2 O 4 ( s ) + NaCl ( aq ) a) If 0.043g of oxygen was produced, how many grams of chlorine reacted? b) How many moles of CaCl 2 reacted? c) How many moles of NaCl were produced if 4.39g of Na 2 C 2 O 4 reacted? STEP 1 : Make sure the equation is balanced! CaCl 2 ( aq ) + Na 2 C 2 O 4 ( aq ) CaC 2 O 4 ( s ) + NaCl ( aq ) Ca 1 1 Ca Cl 2 1 Cl Na 2 1 Na C 2 O 4 1 1 C 2 O 4 The equation is not balanced. Adding a 2 in front of NaCl in the products yields: CaCl 2 ( aq ) + Na 2 C 2 O 4 ( aq ) CaC 2 O 4 ( s ) + 2 NaCl ( aq ) Ca 1 1 Ca Cl 2 2 1 Cl Na 2 2 1 Na C 2 O 4 1 1 C 2 O 4 Now the equation has equal numbers of each atom in both reactants and products....
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