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3 years ago

A balanced equation for the combustion of octane with oxygen to obtain carbon dioxide and water

1 answer:

6 0

Octane is C8H18, Carbon Dioxide is CO2, Oxygen is O2, and water is H2O. Thus, the reaction will be in the form:

C8H18+O2 -> CO2+H2O

However, it is not balanced. We start with just one C8H18. This requires 8 CO2s to account for the 8 carbon atoms and 9 H2Os to account for the 18 hydrogen atoms. This is a total of 8*2+9=25 oxygen atoms. We can't have 25/2 of a molecule, so we multiply all coefficients by two. Therefore, our balanced equation is:

2 C8H18 + 25 O2 -> 16 CO2 + 18 H2O

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Answer:

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3 years ago

When and enzyme lowers the activation energy of a reaction, what happens?

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Enzymes lower the activation energy of a reaction by binding one of the reactants, called a substrate, and holding it in a way that lowers the activation energy.

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3 years ago

The density of ethanol, C 2H 5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 25.0 g of CO 2 according

gogolik [260]

Answer:

11.1mL

Explanation:

The reaction expression is given as:

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

Given parameters:

density of ethanol = 0.789g/mL

mass of CO₂ = 25g

Unknown:

Volume of ethanol = ?

Solution:

First find the number of moles of the CO₂ from the given mass;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of CO₂ = 12 + 2(16) = 44g/mol

Number of moles = $\frac{25}{44}$ = 0.57mol

Then;

Find the number of moles of ethanol used;

3 moles of CO₂ is produced from 1 mole of ethanol;

0.57mole of CO₂ will be produced from $\frac{0.57}{3}$ = 0.19mole of ethanol

Now;

Find the mass of the ethanol from the given mole;

Mass of ethanol = number of moles x molar mass

Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol

Mass of ethanol = 0.19 x 46 = 8.74g

Then;

Density is the mass per unit volume of a substance;

Density = $\frac{mass}{volume}$

Volume = $\frac{mass}{density}$

Volume = $\frac{8.74}{0.789}$ = 11.1mL

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3 years ago

What is the poH of a<br> 2.6 x 10-6 M H+ solution?<br> pOH = [?]

KatRina [158]

Answer:

pOH = 8.41

Explanation:

From the question given above, we obtained the following information:

Concentration of Hydrogen ion [H⁺] = 2.6×10¯⁶ M

pOH =?

Next, we shall determine the pH of the solution. This can be obtained as follow:

Concentration of Hydrogen ion [H⁺] = 2.6×10¯⁶ M

pH =?

pH = – Log [H⁺]

pH = – Log (2.6×10¯⁶)

pH = 5.59

Finally, we shall determine the pOH of the solution. This can be obtained as follow:

pH = 5.59

pOH =?

pH + pOH = 14

5.59 + pOH = 14

Collect like terms

pOH = 14 – 5.59

pOH = 8.41

Therefore, the pOH of the solution is 8.41

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3 years ago

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marta [7]

Answer:

You can heat it and then let it cool it in a very strong magnetic field.

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3 years ago