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alexira [117]
3 years ago
6

Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 10.3 g of octane is m

ixed with 69. g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to significant digits.
Chemistry
1 answer:
dsp733 years ago
5 0

Answer:

\large \boxed{\text{31.8 g CO}_{2}}

Explanation:

We are given the masses of two reactants and asked to determine the mass of the product.

This looks like a limiting reactant problem.

1. Assemble the information

We will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.  

MM:         114.23     32.00      44.01

               2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 18H₂O

Mass/g:     10.3        69.  

2. Calculate the moles of each reactant

\text{Moles of C$_{8}$H$_{18}$} = \text{10.3 g C$_{8}$H$_{18}$} \times \dfrac{\text{1 mol C$_{8}$H$_{18}$}}{\text{114.23 mol C$_{8}$H$_{18}$}} = \text{0.090 17 mol C$_{8}$H$_{18}$}\\\\\text{Moles of O$_{2}$} = \text{69. g O}_{2} \times \dfrac{\text{1 mol O$_{2}$}}{\text{32.00 g O$_{2}$}} = \text{2.16 mol O$_{2}$}

3. Calculate the moles of CO₂ from each reactant

\textbf{From C$_{8}$H$_{18}$:}\\\text{Moles of CO$_{2}$} =  \text{0.090 17 mol C$_{8}$H$_{18}$} \times \dfrac{\text{16 mol CO$_{2}$}}{\text{2 mol C$_{8}$H$_{18}$}} = \text{0.7214 mol CO}_{2}\\\\\textbf{From O$_{2}$:}\\\text{Moles of CO$_{2}$} =\text{2.16 molO$_{2}$} \times \dfrac{\text{16 mol CO$_{2}$}}{\text{25 mol O$_{2}$}} = \text{1.38 mol CO$_{2}$}\\\\\text{Octane is the limiting reactant because it gives fewer moles of CO$_{2}$.}

4. Calculate the mass of CO₂

\text{ Mass of CO$_{2}$} = \text{0.7214 mol CO$_{2}$} \times \dfrac{\text{44.01 g CO$_{2}$}}{\text{1 mol CO$_{2}$}} = \textbf{31.8 g CO}_\mathbf{{2}}\\\\\text{The reaction produces $\large \boxed{\textbf{31.8 g CO}_\mathbf{{2}}}$}

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Explanation:

<u>1) Data:</u>

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Placing coefficient 2 in front of NaOH and H₂O balances the equation

<u>4) Stoichiometric mole ratio:</u>

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<u>5) Calculations:</u>

a) Molarity formula: M = n / V (in liter)

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b) Nunber of moles of acid:

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c) Number of moles of base, nb:

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d) At equivalence point number of moles of acid = number of moles of base

  • nₐ = nb

  • 0.1053 × (17.88 / 1,000) =  Mb × (15.00 / 1,000)

  • Mb = 0.1053 × 17.88  / 15.00 = 0.1255 mole/liter = 0.1255 M
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