CHEM 1A03 Lecture Notes - Lecture 6: Chemical Equation, Stoichiometry, Silver Nitrate
Stoichiometry and Quantities in Chemical Reactions
applying the relationships between the molar quantities of reactants and products involved in
chemical reactions to perform calculations
the mole ratio is the ratio of the amount in moles of reactants and/or products in a chemical
reaction that arises from the coefficients in a balanced chemical equation
2 H2O 2 H2 + 1 O2
2 mol of water : 2 mol of hydrogen : 1 mol of oxygen
2
2
2
2
OHofmoles
Hofmoles
For every 2 moles of water decomposed, 2 moles of hydrogen gas is made.
OHofmolesHofmoles 22 2
2
The moles of hydrogen will equal the moles of water reacted.
If 10.0 mL of water is decomposed,
Mass of water reacted
Moles of water reacted
Moles of hydrogen produced
0.555 mol of hydrogen will be produced.
2
1
2
2
OHofmoles
Oofmoles
For every 2 moles of water decomposed, 1 mole of oxygen gas is made.
OHofmolesOofmoles 22 2
1
The moles of oxygen will be half the moles of water reacted.
If 10.0 mL of water is decomposed,
Mass of water reacted
Moles of water reacted
Moles of oxygen produced
0.277 mol of oxygen will be produced.
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CHEM 1A03 Full Course Notes
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Document Summary
For every 2 moles of water decomposed, 2 moles of hydrogen gas is made. moles. The moles of hydrogen will equal the moles of water reacted. 0. 555 mol of hydrogen will be produced. moles. For every 2 moles of water decomposed, 1 mole of oxygen gas is made. moles. The moles of oxygen will be half the moles of water reacted. If 10. 0 ml of water is decomposed, In a chemical reaction, the amount of one substance must be known. Using the mole ratio, we can determine how much reactant is needed (or product will be made) 1 cu(s) + 2 agno3(aq) 1 cu(no3)2(aq) + 2 ag(s) For 1 mole of copper, 2 moles of silver nitrate is required. For 1 mole of copper, 2 moles of silver will be produced. Predict the mass of silver metal that will be produced. Excess reagent is the reactant that is present in more than the required amount to complete the reaction.