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For the combustion of n - octane
C8H18 + O2 → CO2 + H2O at 25°C (ignoring resonance in CO2)

ΔH = ΔE – 5.5 × 8.31 × 0.298 in kJ/mol
ΔH = ΔE + 4.5 × 8.31 × 0.298 in kJ/mol
ΔH = ΔE – 4.5 × 8.31 × 0.298 in kJ/mol
ΔH = ΔE – 4.5 + 8.31 × 0.298 in kJ/mol

The correct answer is: ΔH = ΔE – 4.5 × 8.31 × 0.298 in kJ/mol

The lengths of parallel sides of trapezium are in the ratio 7 : 5 and the distance between them is 14cm The area of trapezium is 252 cm².Find the length of its parallel sides.

For such questions, we should know the formula of area of trapezium.

The lengths of parallel sides of trapezium are in the ratio 7 : 5 and the distance between them is 14cm The area of trapezium is 252 cm².Find the length of its parallel sides.

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For such questions, we should know the formula of area of trapezium.

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A so lid piece of metal in the form of a Cuboid of dimes ions 24 cm x 18 cm x 4 cm is melted down and casted into a cube Find length of each edge of cube.

For such questions, we should know the formulas of volume of different shapes. We have to remember that when any metal piece is melted, it's volume doesn't change. The change is there only in the dimensions of the metal piece.

A so lid piece of metal in the form of a Cuboid of dimes ions 24 cm x 18 cm x 4 cm is melted down and casted into a cube Find length of each edge of cube.

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Human body is an example

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It takes 2.56 × 10^–3 equivalents of KOH to neutralise 0.1254 g H₂XO₄. The number of neutrons in X is

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General

Chemistry-

Calculate the weight of iron which will be converted into its oxide by the action of 18g of steam on it.

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AB, A₂ and B₂ are diatomic molecules. If the bond enthalpies of A₂, AB and B₂ are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A₂ and B₂ – 100 kJ mol^–1, what is the bond enthalpy of A_2</sub

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The H – H bond energy is 430 kJ mole^–1 & Cl – Cl bond energy is 240 kJ mole^–1. ( $capital delta$ H)_ffor HClis – 90kJ. The H – Cl bond energy is about

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Entropy change involved in conversion of one mole of liquid water at 373 K to vapour at the same temperature (latent heat of vaporisation of water = 2.257 kJ g^–1).

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100 ml of 0.3 N HCl solution were mixed with 200 ml of 0.6 N H₂SO₄ solution. The final normality of mixture is

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How many moles of electron is needed for the reduction of each mole of Cr in the reaction.
CrO₅ + H₂SO₄ $⟶$ Cr₂(SO₄)₃ + H₂O + O₂

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125 ml of Na₂CO₃ solution requires 100 ml of 0.1 N HCl to reach end point with phenolphthalein as indicator. Molarity of resulting solution with respect to $H C O subscript 3 end subscript superscript minus end superscript$ ion

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For the combustion of n - octaneC8H18 + O2 → CO2 + H2O at 25°C (ignoring resonance in CO2)

ΔH = ΔE – 5.5 × 8.31 × 0.298 in kJ/molΔH = ΔE + 4.5 × 8.31 × 0.298 in kJ/molΔH = ΔE – 4.5 × 8.31 × 0.298 in kJ/molΔH = ΔE – 4.5 + 8.31 × 0.298 in kJ/mol

The correct answer is: ΔH = ΔE – 4.5 × 8.31 × 0.298 in kJ/mol

Related Questions to study

The lengths of parallel sides of trapezium are in the ratio 7 : 5 and the distance between them is 14cm The area of trapezium is 252 cm².Find the length of its parallel sides.

The lengths of parallel sides of trapezium are in the ratio 7 : 5 and the distance between them is 14cm The area of trapezium is 252 cm².Find the length of its parallel sides.

A so lid piece of metal in the form of a Cuboid of dimes ions 24 cm x 18 cm x 4 cm is melted down and casted into a cube Find length of each edge of cube.

A so lid piece of metal in the form of a Cuboid of dimes ions 24 cm x 18 cm x 4 cm is melted down and casted into a cube Find length of each edge of cube.

Human body is an example

Human body is an example

It takes 2.56 × 10–3 equivalents of KOH to neutralise 0.1254 g H2XO4. The number of neutrons in X is

It takes 2.56 × 10–3 equivalents of KOH to neutralise 0.1254 g H2XO4. The number of neutrons in X is

Calculate the weight of iron which will be converted into its oxide by the action of 18g of steam on it.

Calculate the weight of iron which will be converted into its oxide by the action of 18g of steam on it.

AB, A2 and B2 are diatomic molecules. If the bond enthalpies of A2, AB and B2 are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A2 and B2 – 100 kJ mol–1, what is the bond enthalpy of A2</sub

AB, A2 and B2 are diatomic molecules. If the bond enthalpies of A2, AB and B2 are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A2 and B2 – 100 kJ mol–1, what is the bond enthalpy of A2</sub

The H – H bond energy is 430 kJ mole–1 & Cl – Cl bond energy is 240 kJ mole–1. (H)f for HClis – 90kJ. The H – Cl bond energy is about

The H – H bond energy is 430 kJ mole–1 & Cl – Cl bond energy is 240 kJ mole–1. (H)f for HClis – 90kJ. The H – Cl bond energy is about

Entropy change involved in conversion of one mole of liquid water at 373 K to vapour at the same temperature (latent heat of vaporisation of water = 2.257 kJ g–1).

Entropy change involved in conversion of one mole of liquid water at 373 K to vapour at the same temperature (latent heat of vaporisation of water = 2.257 kJ g–1).

The outermost shell electronic configuration 3d5, 4s2 represents

The outermost shell electronic configuration 3d5, 4s2 represents

Which electronic configuration represents a transition element?

Which electronic configuration represents a transition element?

The no. of d-electrons present in Fe2+ ions is

The no. of d-electrons present in Fe2+ ions is

100 ml of 0.3 N HCl solution were mixed with 200 ml of 0.6 N H2SO4 solution. The final normality of mixture is

100 ml of 0.3 N HCl solution were mixed with 200 ml of 0.6 N H2SO4 solution. The final normality of mixture is

How many moles of electron is needed for the reduction of each mole of Cr in the reaction.CrO5 + H2SO4 Cr2(SO4)3 + H2O + O2

How many moles of electron is needed for the reduction of each mole of Cr in the reaction.CrO5 + H2SO4 Cr2(SO4)3 + H2O + O2

125 ml of Na2CO3 solution requires 100 ml of 0.1 N HCl to reach end point with phenolphthalein as indicator. Molarity of resulting solution with respect to ion

125 ml of Na2CO3 solution requires 100 ml of 0.1 N HCl to reach end point with phenolphthalein as indicator. Molarity of resulting solution with respect to ion

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For the combustion of n - octane
C8H18 + O2 → CO2 + H2O at 25°C (ignoring resonance in CO2)

ΔH = ΔE – 5.5 × 8.31 × 0.298 in kJ/mol
ΔH = ΔE + 4.5 × 8.31 × 0.298 in kJ/mol
ΔH = ΔE – 4.5 × 8.31 × 0.298 in kJ/mol
ΔH = ΔE – 4.5 + 8.31 × 0.298 in kJ/mol

It takes 2.56 × 10^–3 equivalents of KOH to neutralise 0.1254 g H₂XO₄. The number of neutrons in X is

It takes 2.56 × 10^–3 equivalents of KOH to neutralise 0.1254 g H₂XO₄. The number of neutrons in X is

AB, A₂ and B₂ are diatomic molecules. If the bond enthalpies of A₂, AB and B₂ are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A₂ and B₂ – 100 kJ mol^–1, what is the bond enthalpy of A_2</sub

AB, A₂ and B₂ are diatomic molecules. If the bond enthalpies of A₂, AB and B₂ are in the ratio 1:1:0.5 and the enthalpy of formation of AB from A₂ and B₂ – 100 kJ mol^–1, what is the bond enthalpy of A_2</sub

The H – H bond energy is 430 kJ mole^–1 & Cl – Cl bond energy is 240 kJ mole^–1. ( $capital delta$ H)_ffor HClis – 90kJ. The H – Cl bond energy is about

The H – H bond energy is 430 kJ mole^–1 & Cl – Cl bond energy is 240 kJ mole^–1. ( $capital delta$ H)_ffor HClis – 90kJ. The H – Cl bond energy is about

Entropy change involved in conversion of one mole of liquid water at 373 K to vapour at the same temperature (latent heat of vaporisation of water = 2.257 kJ g^–1).

Entropy change involved in conversion of one mole of liquid water at 373 K to vapour at the same temperature (latent heat of vaporisation of water = 2.257 kJ g^–1).

The outermost shell electronic configuration 3d⁵, 4s² represents

The outermost shell electronic configuration 3d⁵, 4s² represents

The no. of d-electrons present in Fe²⁺ ions is

The no. of d-electrons present in Fe²⁺ ions is

100 ml of 0.3 N HCl solution were mixed with 200 ml of 0.6 N H₂SO₄ solution. The final normality of mixture is

100 ml of 0.3 N HCl solution were mixed with 200 ml of 0.6 N H₂SO₄ solution. The final normality of mixture is

How many moles of electron is needed for the reduction of each mole of Cr in the reaction.
CrO₅ + H₂SO₄ $⟶$ Cr₂(SO₄)₃ + H₂O + O₂

How many moles of electron is needed for the reduction of each mole of Cr in the reaction.
CrO₅ + H₂SO₄ $⟶$ Cr₂(SO₄)₃ + H₂O + O₂

125 ml of Na₂CO₃ solution requires 100 ml of 0.1 N HCl to reach end point with phenolphthalein as indicator. Molarity of resulting solution with respect to $H C O subscript 3 end subscript superscript minus end superscript$ ion

125 ml of Na₂CO₃ solution requires 100 ml of 0.1 N HCl to reach end point with phenolphthalein as indicator. Molarity of resulting solution with respect to $H C O subscript 3 end subscript superscript minus end superscript$ ion