The enthalpy combustion of a substance...

The enthalpy combustion of a substance

Is always positive

Is always negative

Can be either zero or greater than zero

Is unpredictable till the calculations are done

Text Solution

Verified by Experts

In combustion, enegry releases. Hence it is exothermic, `DeltaH =- ve`.

Topper's Solved these Questions

THERMODYNAMICS
CENGAGE CHEMISTRY ENGLISH|Exercise Exercise|1 Videos
THERMODYNAMICS
CENGAGE CHEMISTRY ENGLISH|Exercise Ex 6.1|26 Videos
STOICHIOMETRY
CENGAGE CHEMISTRY ENGLISH|Exercise Archives Subjective|33 Videos

Similar Questions

Explore conceptually related problems

The enthalpy of combustion of methane, graphite and dihydrogen at 298 K are, -890.3 kJ mol^(-1) -393.5 kJ mol^(-1) , and -285.8 kJ mol^(-1) respectively. Enthapy of formation of CH_(4)(g) will be

Calculate the enthalpy of formation of aniline. The enthalpy of combustion of aniline is 837.5 kcal mol^(-1) . The enthalpies of formation of liquid water and gaseous carbon dioxide are -68.4 and -97.0kcal mol^(-1) respectively. All values are at 298 K .

The enthalpy of combustion of benzoic acid (C_(6)H_(5)COOH) at 298K and 1atm pressure is -2500.0 kJ mol^(-1) . What is DeltaU for the reaction?

The enthalpy of combustion of dimond and enthalpy of formation of carbon dioxide has the same value.

Enthalpy of sublimation of a substance is equal to :

Enthalpy of sublimation of a substance is equal to

The enthalpy of combustion of C, H , and sucrose are -393.5 , -286.2, and -5644.2 kJ/mol calculate the enthalpy of formation of sucrose .

The heat produced by the combustion of 2.0g of benzene in a bomb calorimeter was found to be 123.6 kJ at 25^(@)C . Calculate the enthalpy of combustion of benzene at 25^(@)C .

The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 kJ mol^(-1) respectively. The enthaly of formation of carbon monoxide per mole is :

The enthalpies of combustion of carbon and carbon monoxide in excess of oxygen at 298K and constant pressure are -393.5 and -283.0 kJ mol^(-1) , respectively. Calculate the heat of formation of carbon monoxide at constant volume.

CENGAGE CHEMISTRY ENGLISH-THERMODYNAMICS-Archives (Subjective)

The enthalpy combustion of a substance
Text Solution
|
The enthalpies for the following reactions (DeltaH^(Theta)) at 25^(@)C...
Text Solution
|
The standared enthalpies of formation at 298K for C C1(g), H(2)O(g), C...
Text Solution
|
Given that: i. C(s) + O(2)(g) rarr CO(2)(g) , DeltaH =- 94.05 kcal ...
Text Solution
|
The following statement is true only under some specific conditions. W...
Text Solution
|
The bond dissociation energies of gaseous H(2),Cl(2), and HCl are 100,...
Text Solution
|
The standard molar heat of formation of ethane, carbon dioxide and wat...
Text Solution
|
An intimate mixture of ferric oxide and aluminium is used as solid fue...
Text Solution
|
The enthalpy of combustion of H(2), cyclohexene (C(6)H(10)) and cycloh...
Text Solution
|
CsOH +HCI rarr CsCI +H(2)O, DeltaH =- 13.4 kcal mol^(-1)……….(i) CsOH...
Text Solution
|
Determine enthalpy change for, C(3)H(8(g))+H(2(g))rarr C(2)H(6(g))+C...
Text Solution
|
Compute the heat of formation of liquid methyl alcohol in kilojoule pe...
Text Solution
|
From the following data, calculate the enthalpy change for the combust...
Text Solution
|
The standard heat of formation values of SF(6)(g), S(g), and F(g) are ...
Text Solution
|
Show that the reaction CO(g) +(1//2)O(2)(g) rarr CO(2)(g) at 300K ...
Text Solution
|
A sample of argon gas at 1atm pressure and 27^(@)C expands reversibly ...
Text Solution
|
Determine the enthalpy of formation of B(2)H(6)(g) in kJ/mol of the fo...
Text Solution
|
The standart potential of the following cell is 0.23 at 15^(@)C and 0....
Text Solution
|
When 1pentyne (A) is treated with 4N alcoholic KOH at 175^(@)C, it is ...
Text Solution
|
Two moles of a perfect gas undergo the following processes: a. A rev...
Text Solution
|
C(v) values of He is always (3R)/(2) but C(v) values of H(2) is (3R)/(...
Text Solution
|