HSC Science (General) 12th Board ExamMaharashtra State Board
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

Solution for Calculate the standard enthalpy of combustion of CH3COOH(l) from the following data: - HSC Science (General) 12th Board Exam - Chemistry

Login
Create free account


      Forgot password?

Question

Calculate the standard enthalpy of combustion of CH3COOH(l) from the following data:

`Delta_fH^@(CO_2)=-393.3 kJ mol^-1`

`Delta_fH^@(H_2O)=-285.8 kJ mol^-1`

`Delta_fH^@(CH_3COOH)=-483.2 kJ mol^-1`

Solution

`C_((s))+O_(2(g))->CO_(2(g))`                                     `Delta_fH^@=-393.3 kJ mol^-1`...(1)

`H_(2(g))+1/2O_(2(g))->H_2O_((l))`                               `Delta_fH^@=-285.8 kJ mol^-1`...(2)

`2C_((s))+2H_(2(g))+O_(2(g))->CH_3COOH`        `Delta_fH^@=-483.2 kJ mol^-1` ...(3)

The required equation is,
CH3COOH(l) + 2O2(g) →2CO2(g) + 2H2O(l)

Multiplying equation (1) and equation (2) by 2, then adding to reverse of equation (3).

`2C_((s))+2O_(2(g))->2CO_(2(g))`                                  `Delta_fH^@=-786.6 kJ mol^-1`

`2H_(2(g))+1O_(2(g))->2H_2O_((l))`                               `Delta_fH^@=-571.6 kJ mol^-1`

`CH_3COOH_(l)->2C_((s))+2H_(2(g))+O_(2(g))`          `Delta_fH^@= 483.2 kJ mol^-1`

--------------------------------------------------------------------------------------------

`CH_3COOH_(l)+2O_(2(g))->2CO_(2(g))+2H_2O_((l))`          `Delta_fH^@=-875 kJ mol^-1`

 

 

  Is there an error in this question or solution?

APPEARS IN

 2016-2017 (July) (with solutions)
Question 3.2 | 3.00 marks

Video TutorialsVIEW ALL [1]

Solution Calculate the standard enthalpy of combustion of CH3COOH(l) from the following data: Concept: Chemical Thermodynamics and Energetic - Enthalpy of Bond Dissociation.
S
View in app×