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valentinak56 [21]
3 years ago
11

For a particular isomer of C 8 H 18 , C8H18, the combustion reaction produces 5104.1 kJ 5104.1 kJ of heat per mole of C 8 H 18 (

g ) C8H18(g) consumed, under standard conditions. C 8 H 18 ( g ) + 25 2 O 2 ( g ) ⟶ 8 CO 2 ( g ) + 9 H 2 O ( g ) Δ H ∘ rxn = − 5104.1 kJ / mol C8H18(g)+252O2(g)⟶8CO2(g)+9H2O(g)ΔHrxn°=−5104.1 kJ/mol What is the standard enthalpy of formation of this isomer of C 8 H 18 ( g ) ?
Chemistry
1 answer:
vlada-n [284]3 years ago
7 0

Answer:

The standard enthalpy of formation of this isomer of octane is -220.1 kJ/mol

Explanation:

Step 1: Data given

The combustion reaction of octane produces 5104.1 kJ per mol octane

Step 2: The balanced equation

C8H18(g) + 12.5 O2 ⟶ 8CO2 (g) + 9 H2O (g)  ∆H°rxn = -5104.1 kJ/mol

Step 3:

∆H°rxn = ∆H°f of products minus the ∆H° of reactants

∆H°rxn = ∆H°f products - [∆H°f reactants]

-5104.1 kJ/mol = (8*∆H°fCO2 + 9*∆H°fH20) - (∆H°fC8H18 + 12.5∆H°fO2)

∆H°f C8H18 = ∆H°f 8CO2 + ∆H°f 9H2O+ 5104.1 kJ/mol

∆H°f C8H18 = 8 * (-393.5 kJ)/mol + 9 * (-241.8 kJ/mol)] + 5104.1 kJ /mol

∆H°f C8H18 = -220.1 kJ/mol

The standard enthalpy of formation of this isomer of octane is -220.1 kJ/mol

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Assoli18 [71]

Answer:

0.208mole of CO2

Explanation:

First, let us calculate the number of mole of HC3H3O2 present.

Molarity of HC3H3O2 = 0.833 mol/L

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Mole = 0.833 x 0.25

Mole of HC3H3O2 = 0.208mole

Now, we can easily find the number of mole of CO2 produce by doing the following:

NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2

From the equation,

1mole of HC2H3O2 produced 1 mole of CO2.

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6 0
3 years ago
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How many moles of co2 are produced when 5.20 mol of ethane are burned in an excess of oxygen?
galben [10]
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According to the equation of the reaction of ethane combustion, ethane and carbon dioxide have following stoichiometric ratio:

n(C2H6) : n(CO2) = 1 : 2

n(CO2) = 2 x n(C2H6) 

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6 0
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Calculate the ph of this solution. round to the nearest hundredth. poh = 3.45 ph =
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The potential of hydrogen pH of the solution with the given value of pOH to the nearest hundredth is 10.55.

What is pH of solution?

The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration  [H+] of the given solution.

It is expressed as;

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Also,

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Given that;

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We simply substitute our values into the expression above.

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pH + 3.45 = 14

pH = 14 - 3.45

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Therefore, the potential of hydrogen pH of the solution with the given value of pOH to the nearest hundredth is 10.55.

Learn more about pH & pOH here: brainly.com/question/17144456

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7 0
2 years ago
What is the number of molecule(s)?
Gemiola [76]

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2. 3CaCO3

3. 5NaC2H3O

4. 6NH3

5. 2CaCl2O2

ans ( a). NHCO3

5 0
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Vinil7 [7]
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