The enthalpy of formation of methanol is to be calculatedwith the help of given heat of combustion. Concept introduction: Hess’s Law states that the change in enthalpy fora chemical reaction remains the same whether the reaction takes place in a single step or in a number of steps. The enthalpy change for the reaction is a state function. It depends upon the initial and final states of the system and not on the path followed. If any reaction is reversed, then the sign of enthalpy change will also reverse. If enthalpy change is positive, then it will become negative and vice versa. If any reaction is multiplied or divided any number, then its enthalpy change is also multiplied and divided by the same number.

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Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.

Chapter 5, Problem 51QP

Interpretation Introduction

Interpretation:

The enthalpy of formation of methanol is to be calculatedwith the help of given heat of combustion.

Concept introduction:

Hess’s Law states that the change in enthalpy fora chemical reaction remains the same whether the reaction takes place in a single step or in a number of steps.

The enthalpy change for the reaction is a state function. It depends upon the initial and final states of the system and not on the path followed.

If any reaction is reversed, then the sign of enthalpy change will also reverse. If enthalpy change is positive, then it will become negative and vice versa.

If any reaction is multiplied or divided any number, then its enthalpy change is also multiplied and divided by the same number.

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& Calculate the molar enthalpy of combustion (A combH) of 1.80 g of pyruvic acid (CH3COCOOH; 88.1 g mol-1) at 37 °C when they are combusted in a calorimeter at constant volume with a calorimeter constant = 1.62 kJ °C-1 and the temperature rose by 1.55 °C. Given: R = 8.314 J mol −1 °C-1 and the combustion reaction: AN C3H4O3 + 2.502(g) → 3CO2(g) + 2H2O(l)

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Answer 2

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Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.

Chapter 5, Problem 51QP

Interpretation Introduction

Interpretation:

The enthalpy of formation of methanol is to be calculatedwith the help of given heat of combustion.

Concept introduction:

Hess’s Law states that the change in enthalpy fora chemical reaction remains the same whether the reaction takes place in a single step or in a number of steps.

The enthalpy change for the reaction is a state function. It depends upon the initial and final states of the system and not on the path followed.

If any reaction is reversed, then the sign of enthalpy change will also reverse. If enthalpy change is positive, then it will become negative and vice versa.

If any reaction is multiplied or divided any number, then its enthalpy change is also multiplied and divided by the same number.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 3

Question

Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.

Chapter 5, Problem 51QP

Interpretation Introduction

Interpretation:

The enthalpy of formation of methanol is to be calculatedwith the help of given heat of combustion.

Concept introduction:

Hess’s Law states that the change in enthalpy fora chemical reaction remains the same whether the reaction takes place in a single step or in a number of steps.

The enthalpy change for the reaction is a state function. It depends upon the initial and final states of the system and not on the path followed.

If any reaction is reversed, then the sign of enthalpy change will also reverse. If enthalpy change is positive, then it will become negative and vice versa.

If any reaction is multiplied or divided any number, then its enthalpy change is also multiplied and divided by the same number.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.

Chapter 5, Problem 51QP

Interpretation Introduction