Compound Molar Mass Calculations
These abbreviations stand for solid, liquid, gas, and aqueous solution, respectively.
(s), (l), (g), (aq)
This is the mass in grams of 0.5 moles of Ba(NO₃)₂
130.675 g
Balance: C₂H₆ + O₂ → CO₂ + H₂O
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
A substance combines with oxygen, releasing heat and light.
Combustion reaction
2H₂O (l) → [electricity] 2H₂ (g) + O₂ (g)
electrolysis reaction
This symbol (Δ) over the arrow indicates this condition for the reaction.
heat
This is the mass in grams of 1.5 moles of CO₂ (molar mass = 44.01 g/mol).
66.015 g
Balance: Fe + H₂O → Fe₃O₄ + H₂
3Fe + 4H₂O → Fe₃O₄ + 4H₂
Using electricity to drive a decomposition reaction.
electrolysis reaction
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
combustion reaction
This is the number placed before a formula to balance an equation.
coefficient
This is the mass in grams of 3 moles of Ba(NO₃)₂.
784.05g
Balance: NaOH + H₃PO₄ → Na₃PO₄ + H₂O
3NaOH + H₃PO₄ → Na₃PO₄ + 3H₂O
Ions in two compounds exchange places to form new compounds.
double displacement reaction
CaCO₃ (s) → CaO (s) + CO₂ (g)
decomposition reaction
This is a solid formed from a reaction in a solution.
Precipitate
This is the molar mass of NaCl.
58.44 g/mol
Balance: KClO₃ → KCl + O₂
2KClO₃ → 2KCl + 3O₂
Two or more substances combine to form a new compound.
synthesis reaction
Fe (s) + S (s) → FeS (s)
synthesis reaction
This symbol indicates that a reaction is reversible.
double arrow (⇌)
This is the number of moles in 90.04 g of H₂O (molar mass = 18.02 g/mol).
5 moles
Balance: (NH₄)₂Cr₂O₇ → N₂ + Cr₂O₃ + H₂O
(NH₄)₂Cr₂O₇ → N₂ + Cr₂O₃ + 4H₂O
A single compound breaks down into multiple simpler substances.
decomposition reaction
AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)
double displacement reaction