Key Concepts: Stoichiometric Calculations

Core Definitions

• Stoichiometry: The calculation of quantities in chemical reactions using mole ratios from balanced equations.
• Mole Ratio: The ratio of moles of one substance to another from the coefficients of a balanced equation.
• Steps: 1) Balance equation. 2) Convert given to moles. 3) Use mole ratio. 4) Convert to desired unit.
• Mass-to-Mass: Given grams → moles (÷ molar mass) → mole ratio → moles → grams (× molar mass).
• Volume-to-Volume (Gas): At STP, mole ratios equal volume ratios for gases.
• Balanced Equation is Key: All stoichiometric calculations begin with a correctly balanced equation.