Chemistry

C2H5OH(l) + 3 O2(g) -> 2 CO2(g) + 3 H2O(g)

During an experiment 10.00 g of ethanol is completely
burned in air to release CO2(g) and H2O(g) as shown in
the equation above. During the combustion, 296.6 kJ of
heat energy is released. What is the molar enthalpy of
combustion, H˚comb?

(A) –2966 kJ•mol–1

(B) –1366 kJ•mol–1

(C) –64.36 kJ•mol–1

(D) –29.66 kJ•mol–1

I am unsure on how B is the correct answer. I have never been taught over this, I am preparing for Chemolympiad.

1. 👍
2. 👎
3. 👁
1. C2H5OH + 3O2 ==> 2CO2 + 3H2O
delta Hcomb = -296.6 kJ.
So you have 296.6 kJ released for 10 g; you want to know how much is released for 1 mol (46.07g); therefore,
dH = -296.6 x 46.07/10 = ?

1. 👍
2. 👎

Similar Questions

1. chemistry

Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it's negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the

2. Chemistry

Enter the balanced complete ionic equation for HCl(aq)+K2CO3(aq)→H2O(l)+CO2(g)+KCl(aq) Would it be: 2H+(aq) + 2Cl^-(aq) + 2K^+(aq) + CO3^2-(aq) => H2O(l) + CO2(g) + 2KCl(aq)? Thanks

3. chemistry

For the system H2(g) + CO2(g) H2O(g) + CO(g) at equilibrium, the addition of H2(g) would cause (according to LeChatelier’s principle) 1. more H2O(g) and CO(g) to form. 2. only more CO2(g) to form. 3. only more H2O(g) to form. 4.

4. chemistry

Which of the following chemical reactions represents a neutralization reaction? A. CH4 + 2O2 CO2 + H2O B. HCl + NaOH H2O + NaCl C. NH3 + H2O NH4++ OH- D. CH3COOH + H2O CH3COO- + H3O+

1. chemistry

Carbon dioxide (CO2) reacts with water (H2O) to form carbonic acid (H2CO3). Which equation demonstrates the law of conservation of matter for this reaction? A. 2 CO + H2O —> H2CO3 B. CO2 + H2O —> H2CO3 C. CO2 + 2 H2O —> 2

2. Science/Chemistry

Write a Balanced equation for the chemcial reaction Acetylene gas (C2H2) burns in a welding torch with oxygen to form carbon dioxide gas and water vapor. C2H2(g) + O2(g) ==> CO2(g) + H2O(g) It isn't balanced. I will leave that for

1. Which is true about spontaneous reactions? a. For a reaction to be spontaneous, Keq = 1. b. Spontaneous reactions happen very rapidly. c. A chemical reaction is spontaneous in both directions. *** d. Spontaneous reactions do

4. Chemistry (URGENT)

Balance the following equations. 3. C12H22O11 + O2 = CO2 + H2O Answer: C12H22O11 + 12 O2 = 12 CO2 + 11 H2O 8. CH3OH + O2 = CO2 + H2O Answer: 2 CH3OH + 3 O2 = 2 CO2 + 4 H2O I balanced all the others just fine. But I seem to be

1. Chemistry

Balance this equation. NaHCO3(s) + heat ----> Na2CO3(s) + H2O(l) + CO2(g). i balanced it & got: 2NaHCO3(s)+ heat -->Na2CO3(s)+ H2O(g)+CO2(g) is this right ? Determine how many moles of CO2(g) is produced when 7mols of NaHCO3 are

2. chemistry

The complete combustion of ethanol, C2H5OH (FW = 46.0 g/mol), proceeds as follows: C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l) ΔH = −555 kJ What is the enthalpy change for combustion of 15.0 g of ethanol

3. Chemistry

Ethanol, used in alcoholic beverages, can be produced by fermentation of sucrose. The balanced equation for the fermentation process is shown below. What mass of ethanol (C2H5OH) would be produced when 2.61 g sucrose reacts by

4. Chemistry

Lysine, an essential amino acid in the human body, contains C,H,O, and N. In one experiment, the complete combustion of 2.175g of lysine gave 3.94g CO2 and 1.89g H2O. In a separate experiment, 1.873 g of lysine gave 0.436 g NH3.