Question

Calculate ΔS°for the combustion of methanol. 2CH3OH(g) + 3O2(g) → 2CO2(g) + 4H2O(g) Substance CH3OH(g) O2(g)...

Calculate ΔS°for the combustion of methanol.

2CH3OH(g) + 3O2(g) → 2CO2(g) + 4H2O(g)

Substance CH3OH(g) O2(g) CO2(g) H2O(g)
S°(J/K·mol) 240 205.138 213.74 188.825

-42.6 J/K

-87.3 J/K

42.6 J/K

87.3 J/K


Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

The given reaction is

2 CH3OH (g) + 3 O2 (g) -------> 2 CO2 (g) + 4 H2O (g)

The entropy change is given as

ΔS0 = Σn.S0(products) – Σn.S0(reactants) where n = number of moles

= [(2 mole)*S0(CO2,g) + (4 mole)*S0(H2O,g)] – [(2 mole)*S0(CH3OH,g) + (3 mole)*S0(O2,g)]

= [(2 mole)*(213.74 J/mol.K) + (4 mole)*(188.825 J/mol.K)] – [(2 mole)*(240 J/mol.K) + (3 mole)*(205.138 J/mol.K)]

= (427.48 + 755.3) J/K – (480 + 615.414) J/K

= 1182.78 J/K – 1095.414 J/K

= 87.366 J/K ≈ 87.3 J/K (ans).

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The balanced equation for the combustion of methanol is 2CH3OH(l)+3O2(g)→2CO2(g)+4H2O(g). Calculate ΔH∘rxn, ΔS∘rxn, and  ΔG∘rxn at 25...
The balanced equation for the combustion of methanol is 2CH3OH(l)+3O2(g)→2CO2(g)+4H2O(g). Calculate ΔH∘rxn, ΔS∘rxn, and  ΔG∘rxn at 25 ∘C. Is it spontaneous or nonspontaneous?
1. Consider the following chemical reaction: 2CH3OH(l) + 3O2 (g) → 2CO2 (g) + 4H2O(l) Calculate...
1. Consider the following chemical reaction: 2CH3OH(l) + 3O2 (g) → 2CO2 (g) + 4H2O(l) Calculate the number of moles of CO2 produced when 11.25 mL of methanol CH3OH reacted completely with O2 (g). The density of methanol is 0.79 g/mL.
Calculate the standard entropy change for the following reaction at 25 °C. S° 2CH3OH(g)+3O2(g)=2CO2(g)+4H2O(g)
Calculate the standard entropy change for the following reaction at 25 °C. S° 2CH3OH(g)+3O2(g)=2CO2(g)+4H2O(g)
Certain race cars use methanol (CH3OH; also called wood alcohol) as a fuel. Methanol has a...
Certain race cars use methanol (CH3OH; also called wood alcohol) as a fuel. Methanol has a molecular mass of 32.0 g/mol and a density of 0.79 g/mL. The combustion of methanol occurs according to the following equation: 2CH3OH + 3O2 → 2CO2 + 4H2O In a particular reaction 2.00 L of methanol are reacted with 80.0 kg of oxygen. What is the limiting reactant? What reactant and how many grams of it are left over? How many grams of carbon...
How many grams of methanol (CH3OH) would need to be combusted to raise the temperature of...
How many grams of methanol (CH3OH) would need to be combusted to raise the temperature of 25.0 L of water by 2.25 °C, given the information below? The specific heat of water is 4.18 J/g⋅°C. Assume the density of water is 1.000 g/mL. 2CH3OH(l) + 3O2(g) = 2CO2(g) + 4H2O(l) ∆H° = –1452.8 kJ
Methanol (CH3OH) has been proposed as an alternative fuel. Calculate the standard enthalpy of combustion per...
Methanol (CH3OH) has been proposed as an alternative fuel. Calculate the standard enthalpy of combustion per gram of liquid methanol. Standard Heats of Formation: CH3OH(l) = –239 kJ/mol O2(g) = 0 kJ/mol CO2(g) = –393.5 kJ/mol H2O(l) = –286 kJ/mol ΔH =_______ kJ/g CH3OH
use standard enthalpies of format to calculate Hrxn for each reaction. 1:2H2S (g) +3O2 (g)     2H2O...
use standard enthalpies of format to calculate Hrxn for each reaction. 1:2H2S (g) +3O2 (g)     2H2O (l) 2SO2 (g) 2: 3NO2 (g)+H2O (l)       2HNO3 (aq) +NO (g) 3: N2O4 (g) + 4H2 (g)      N2 (g) +4H2O (g) 4: CR2O3 (S) +3CO (g)     2CR (S)+3CO2 (g) Calculate Kc for each reaction and predict whether reactant and product s will be favor at equilibrium 1: CH3OH(g)         CO (g) + 2H2 (g) 2: 2CO2 (g)+2CF2 (g)        4COF2 (g) 3: 6COF2 (g)         3CO2(g)+3CF2 (g)...
A) If 30.8 g of O2 are mixed with 30.8 g of H2 and the mixture...
A) If 30.8 g of O2 are mixed with 30.8 g of H2 and the mixture is ignited, what mass of water is produced? B) Iron is produced from its ore by the reactions: 2C(s)+O2(g) → 2CO(g) Fe2O3(s)+3CO(g) → 2Fe(s) + 3co2(g) How many moles of O2(g) are needed to produce 9.5 moles of Fe(s)? C) Which of the following equations correctly describes the combustion of CH4and O2to produce water (H2O) and carbon dioxide (CO2)? a)     CH4 + O2 ...
Use the following calorimetric data to calculate the heat of combustion (burning) of the carbon compound...
Use the following calorimetric data to calculate the heat of combustion (burning) of the carbon compound shown below: C3H8 (g) + 5O2 (g) → 3CO2(g) + 4H2O(g) reaction ΔHo (kJ) C(s) + O2(g) → CO2(g) -393.5 C(s) → C(g) +718.4 H2O(l) → H2O(g) +44.0 H2(g) + 1/2 O2(g) → H2O(l) -285.8 3C(s) + 4H2(g) → C3H8(g) -103.8 C(s) + 2H2(g) + 1/2O2(g) → CH3OH(l) -238.7 6C(s) + 3H2(g) → C6H6(g) +82.9 C6H6(l) → C6H6(g) +33.9 CH3OH(l) → CH3OH(g) +38.0 ΔHo...
Problem 5.64 Part A From the enthalpies of reaction 2C(s)+O2(g)→2CO(g)ΔH=−221.0kJ 2C(s)+O2(g)+4H2(g)→2CH3OH(g)ΔH=−402.4kJ calculate ΔH for the reaction...
Problem 5.64 Part A From the enthalpies of reaction 2C(s)+O2(g)→2CO(g)ΔH=−221.0kJ 2C(s)+O2(g)+4H2(g)→2CH3OH(g)ΔH=−402.4kJ calculate ΔH for the reaction CO(g)+2H2(g)→CH3OH(g)
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT