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Gravimetric Stoichiometry

Gravimetric Stoichiometry. LG: I can use mole ratios to predict masses of reactants and products in a chemical reaction. Gravimetric Stoichiometry. The procedure for calculating masses of reactants or products in a chemical reaction is called Gravimetric Stoichiometry

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Gravimetric Stoichiometry

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  1. Gravimetric Stoichiometry LG: I can use mole ratios to predict masses of reactants and products in a chemical reaction.

  2. Gravimetric Stoichiometry • The procedure for calculating masses of reactants or products in a chemical reaction is called Gravimetric Stoichiometry • All predictions are based on the number of moles and the mole ratio in the equation Mass of Reactant Mass of Product Moles of Reactant Moles of Product

  3. Example 1 • 1.00g of zinc reacts with sulfur to produce zinc sulfide. If there is excess sulfur, what mass of zinc sulfide should be produced? Zn(s) + S8(s)ZnS(s) Steps: • Balance the equation to determine mole ratio • Convert mass of zinc to moles (using molar mass of Zn) • Use mole ratio to predict moles of ZnS produced • Convert moles of ZnS to mass (using molar mass of ZnS) Mrs. Rickert’s Tip: Organize info in a table and show all units!

  4. Example 2 • On space shuttles, exhaled carbon dioxide is removed from the air by reacting it with solid lithium hydroxide: CO2(g) + LiOH(s) Li2CO3(aq) + H2O(l) • If a typical astronaut exhales880g of CO2 per day, what mass of lithium hydroxide would be required per astronaut, per day?

  5. Stoichiometry Amounts • Refer to Example 2: • Notice that 40 moles of LiOH were needed to react with 20 moles of CO2. These values are multiples of the mole ratio indicated by the balanced equation. • Stoichiometric Amount – is a quantity that is in the same proportion as the coefficients in the balanced equation. • When Stoichiometric amounts of reactants are used, there should be no excess reagentsat the end of a reaction – in other words “the reaction goes to completion”

  6. Homework • New Text: Pg. 325 # 5 – 10 • Old Text: Pg. 228 # 9 – 10; Pg. 229 # 2 – 4 • Note: If you are asked to make a prediction about products based on the mass of a single reactant, assume all other reactants are present in excess quantities

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