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4.1: Stoichiometry

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    Moles and Grams from Grams

    Exercise \(\PageIndex{1}\)

    For the balanced chemical equation

    Al(s) + 3Ag+(aq) → Al3+(aq) + 3Ag(s)

    how many moles and grams of Ag are produced when 0.661 mol of Al are reacted?

    Answer

    \(0.661 mol Al*\left ( \frac{3 mol Ag}{1 mol Al} \right )= 1.98 mol Ag\)

    \(0.661 mol Al*\left ( \frac{3 mol Ag}{1 mol Al} \right )*\left ( \frac{107.8682 g Ag}{1 mol Ag} \right )=214 grams Ag\)

    Exercise \(\PageIndex{2}\)

    For the balanced chemical reaction

    4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(ℓ)

    how many moles and grams of H2O are produced when 0.669 mol of NH3 react?

    Answer

    1.00 mol H2O, 18.0 grams of H2O

     

    Moles and grams from grams

    Exercise \(\PageIndex{3}\)

    For the balanced chemical reaction

    4NaOH(aq) + 2S(s) + 3O2(g) → 2Na2SO4(aq) + 2H2O(ℓ)

    how many moles and grams of Na2SO4 are formed when 1.22 grams of O2 react?

    Answer

    \(1.22 g O_{2}*\left ( \frac{1 mol O_{2}}{31.988 g O_{2}} \right )*\left ( \frac{2 mol Na_{2}SO_{4}}{3 mol O_{2}} \right )= 0.0254 mol Na_{2}SO_{4}\)

    \(1.22 g O_{2}*\left ( \frac{1 mol O_{2}}{31.988 g O_{2}} \right )*\left ( \frac{2 mol Na_{2}SO_{4}}{3 mol O_{2}} \right )*\left ( \frac{142.04314 g Na_{2}SO_{4}}{1 mol Na_{2}SO_{4}} \right )=3.61 g Na_{2}SO_{4}\)

    Exercise \(\PageIndex{4}\)

    For the balanced chemical reaction

    4KO2(s) + 2CO2(g) → 2K2CO3(s) + 3O2(g)

    determine the number of moles  and grams of both products formed when 6.88 grams of KO2 react.

    Answer

    Moles: 0.0484 mol K2CO3, 0.0726 mol O2 

    Grams: 6.69 grams K2CO3, 2.32 grams O2 

     

    4.1: Stoichiometry is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.

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