4NH3 + 3O2 ==> 2N2 + 6H2O
mols NH3 = grams/molar mass = ?
mols O2 = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols NH3 to mols H2O.
Do the same for mols O2 to mols H2O.
It is likely that these two values will not agree which means one of them is wrong. The correct value in limiting reagent problems is ALWAYS the smaller value and the regent producing that value is the limiting regent.
Using the smaller value, convert mols N2 to g N2. g = mols x molar mass = ?
After you know the identity of the limiting reagent (LR), repeat step 2 of converting mols or LR to mols of non-LR used. Then subtract from the initial value to find amount remaining in excess.
a mixture of 34.0g of ammonia and 50.0g of elemental oxygen react to form elemental nitrogen and water. Please write a balanced chemical equation for this reaction. Find the theoretical yield of water in grams and give the amount of excess reactant in grams
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