Question

2 C6H14 + 19 O2 --> 12 CO2 + 14 H2O

Given 250 g of Oxygen and 50 grams of CoH14 what is the maximum amount of water that can be formed?
• Box 1 = number
• Box 2 = units
Box 3 = Substance​

Answer 1

4.06 mol H₂O

Step-by-step explanation:

• 2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

First we convert the given masses of reactants into moles, using their respective molar masses:

• 250 g O₂ ÷ 32 g/mol = 7.81 mol O₂

• 50 g C₆H₁₄ ÷ 86 g/mol = 0.58 mol C₆H₁₄

Now we calculate how many O₂ moles would react completely with 0.58 C₆H₁₄ moles, using the stoichiometric coefficients of the reaction:

• 0.58 mol C₆H₁₄ *
  `(19molO_2)/(2molC_6H_(14))` = 5.51 mol O₂

As there are more O₂ moles than required (7.81 vs 5.51), O₂ is the reactant in excess. That means that C₆H₁₄ is the limiting reactant.

Now we can calculate how much water can be formed, using the number of moles of the limiting reactant:

• 0.58 mol C₆H₁₄ *
  `(14molH_2O)/(2molC_6H_(14))` = 4.06 mol H₂O