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lakkis [162]
3 years ago
10

How many moles of steam are produced when 5.74 moles of octane (C8H18) react?

Chemistry
1 answer:
crimeas [40]3 years ago
3 0
This is a combustion reaction, which always has the hydrocarbon and oxygen as reactants and then carbon dioxide and water (which is steam in this case) as products.

C8H18 + O2 —> CO2 + H2O

Balance your carbons first. You want to get 8 carbons on both sides.

C8H18 + O2 —> 8CO2 + H2O

Now balance your hydrogens. You want 18 hydrogens on both sides.

C8H18 + O2 —> 8CO2 + 9H2O

Now balance your oxygens. You have 2 on the left and 25 on the right. The O2 reactant needs a coefficient of 12.5 to balance this.

C8H18 + 12.5O2 —> 8CO2 + 9H2O

However, you can’t have decimals for coefficients in a reaction. So, multiply everything by 2.

2C8H18 + 25O2 —> 16CO2 + 18H2O

Now, use your mole ratio of 18 mol H2O for every 2 mol C8H18 to solve.

5.74 mol C8H18 • (18 mol H2O / 2 mol C8H18) = 51.7 mol H2O (steam)
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dlinn [17]
scientific notation : answer
3 0
3 years ago
A mixture of hydrocarbons contains 38.3% hexane, C6H14, 13.9% octane, C8H18, and 47.8% decane, C10H22. The mixture is combusted
GaryK [48]

Answer:

52.206 kg

Explanation:

From the given information:

Mass of hexane C6H14 = 19.3*10^3 \ g \times  \dfrac{38.3}{100}

= 7391.9 g

Mass of octane C8H18 = 19.3*10^3 \ g \times  \dfrac{13.9}{100}

= 2682.7 g

Mass of decane C10H22 = 19.3*10^3 \ g \times  \dfrac{47.8}{100}

= 9225.4 g

However, recall that:

number of moles of an atom = mass/molar mass

∴

For hexane, no of moles = 7391.9 g/86.18 g/mol

= 85.77 moles

For octane, no of moles = 2682.7 g/114.23 g/mol

= 23.49 moles

For decane, no of moles = 9225.4 g/142.29 g/mol

= 64.84 moles

Therefore:

number of moles of CO2 produced = (6 × 85.77)+(23.49)+(10×64.84) moles

= 1186.51 moles

Finally, the mass of CO2 produced is:

= 1186.51 mol × 44 g/mol

= 52206.44  g

= 52.206 kg

4 0
2 years ago
How much energy is contained in a particle that has a mass of m = 1 ug
Fudgin [204]

Answer:

90MJ

Explanation:

Energy= mc^2

Where c= speed of light

m= mass of the object

Mass= m = 1 ug ( then we need to convert from micro gram to micro Joule)= 0.000000001

C= 3× 10^8 m/s

E= = [0.000000001 × (3× 10^8 )^2]

E = [0.000000001 × 89 875 517 873 681]

= 89 875 517.9 joule

Then we can convert to megajoules as

90MJ

5 0
3 years ago
Which of these is an example of a physical change?
MissTica
Sugar dissolving in warm water is an example of physical change.

physical change is doesn't alter the composition or the identity of the substance .
That's mean when you dissolves sugar in water, after a while the object will be the same which mean that the component doesn't change
5 0
3 years ago
Read 2 more answers
Which of the following is NOT a type of nuclear decay? *<br> Alpha<br> Beta<br> Gamma<br> Delta
wolverine [178]

Answer:

Delta

Explanation:

Delta is a not a type of nuclear decay. Most times, the delta sign is used to denote a change between the initial and final states of a reaction.

There are three main types of nuclear decay which are:

  • Alpha decay
  • Beta decay
  • Gamma decay
  1. Alpha decay results in the formation of alpha particles.
  2. Beta decay produces electron like particles.
  3. Gamma decay produces gamma radiations.
8 0
3 years ago
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