Change in enthalpy - H for combustion of fuel is-

The correct option is B negativeNegative; Enthalpy change (Δ H) is negative for combustion of fuel #160;because when a substance undergoes combustion i ...

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Standard X

Physics

CNG,LNG,LPG

Change in ent...

Question

Change in enthalpy $(Δ H)$ for combustion of fuel is:

positive

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zero

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negative

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may be negative or positive

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Solution

The correct option is B negative
Negative; Enthalpy change $(Δ H)$ is negative for combustion of fuel because when a substance undergoes combustion it releases energy as combustion is exothermic so $Δ H$ has negative sign.

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Similar questions

Q. Diborane is a potential rocket fuel which undergoes combustion according to the reaction

B_{2} H_{6 (g)} + 3 O_{2 (g)} \to B_{2} O_{3 (s)} + 3 H_{2} O (g)

Form the following dada, calculation the enthalpy change for the combustion of diborane.

2 B (s) + (3 / 2) O_{2 (g)} \to B_{2} O_{3 (s)}

Δ H = - 1273 k J m o l^{- 1}

H_{2 (g)} + (1 / 2) O_{2 (g)} \to H_{2} O (1)

Δ H = - 286 k J m o l^{- 1}

H_{2} O_{(} 1) \to H_{2} O_{(} g)

Δ H = 44 k J m o l^{- 1}

2 B (s) + 3 H_{2 (g)} \to B_{2} H_{6 (g)}

Δ H = 36 K J m o l^{- 1}

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Change in enthalpy (ΔH) for combustion of fuel is:

The correct option is B negativeNegative; Enthalpy change (ΔH) is negative for combustion of fuel because when a substance undergoes combustion it releases energy as combustion is exothermic so ΔH has negative sign.

Change in enthalpy $(Δ H)$ for combustion of fuel is:

The correct option is B negative
Negative; Enthalpy change $(Δ H)$ is negative for combustion of fuel because when a substance undergoes combustion it releases energy as combustion is exothermic so $Δ H$ has negative sign.