4.1: Stoichiometry
- Page ID
- 166315
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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