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The combustion of 0.200 mol of liquid ca...

The combustion of 0.200 mol of liquid carbon disulphide, `CS_(2)` to give `CO_(2)(g) and SO_(2)(g)` releases 215 KJ of heat . What is `DeltaH_(F)^(@)` for `CS_(2)(l)` in `Kjxxmol^(-1)`? ,
`{:(DeltaH_(f)^(@),kj.mol^(-1)),(CO_(2)(g),-393.5),(SO_(2)(g),-296.8):}`

A

385

B

87.5

C

`-385`

D

`-475`

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The correct Answer is:
b
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The combustion of 0.2 mol of liquid carbon disulphide CS_2 to give CO_2(g) and SO_2(g) releases 215 kJ of heat. What is Delta H_(f)^(@) "for" CS_(2(l)) "in" kJmol^(-1) :

The combustion of 1 mol of benzene takes place at 298 K and 1 atm . After combustion, CO_(2)(g) and H_(2)O(l) are produced and 3267.0 kJ of heat is librated. Calculate the standard entalpy of formation, Delta_(f)H^(Θ) of benzene Given: Delta_(f)H^(Θ)CO_(2)(g) = -393.5 kJ mol^(-1) Delta_(f)H^(Θ)H_(2)O(l) = -285.83 kJ mol^(-1) .

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The heat evolved on combustion of 1g starch (C_(6)H_(10)O_(5))_(n) into CO_(2) and H_(2)O_((l)) is 17.49kJ g^(-1) . Compute the enthalpy of formation of 1g starch. Given, DeltaH_(f) of H_(2)O_((l))=-285.85kJ mol^(-1), DeltaH_(f) of CO_(2)=-293.7kJ mol^(-1) .

When 12.0g of carbon (graphite)reacted with oxygen to form CO and CO_(2) at 25^(@)C and constant pressure, 252 kJ of heat was released and no carbon remained. If Delta H_(f)^(0)(CO,g)= -110.5 kJ mol^(-1) and Delta H_(f)^(0)(CO_(2),g)= -393.5 kJ mol^(-1) ,calculate the mass of oxygen consumed.

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For the reaction 3N_(2)O(g)+2NH_(3)(g)to4N_(2)(g)+3H_(2)O(g),DeltaH^(@)=-879.6kJ If DeltaH_(f)^(@)[NH_(3)(g)]=-45.9kJ" "mol^(-1) , DeltaH_(f)^(@)[H_(2)O(g)]=-241.8kJ" "mol^(-1) Then DeltaH_(f)^(@)[N_(2)O(g)] will be:

Calculate the enthalpy of combustion of benzene (l) on the basis of the following data: a. Resonance energy of benzene (l) =- 152 kJ// mol b. Enthalpy of hydrogenation of cyclohexene (l) =- 119 kJ//mol c. Delta_(f)H^(Theta)C_(6)H_(12)(l) =- 156 kJ mol^(-1) d. Delta_(f)H^(Theta) of H_(2)O(l) =- 285.8 kJ mol^(-1) e. Delta_(f)H^(Theta)of CO_(2)(g) =- 393.5 kJ mol^(-1)

In the reaction , CO_(2)(g)+H_(2)(g)rarrCO(g)+H_(2)O(g), " "DeltaH= 2.8kJ, DeltaH represents

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