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 Given : 

(i) C (graphite)+ O_{2}(g)\rightarrow CO_{2}(g);\\\Delta rH^{\Theta }=x\: kJ mol^{-1}

(ii) C (graphite)+\frac{1}{2} O_{2}(g)\rightarrow CO_{2}(g);\\\Delta rH^{\Theta }=y \: \: kJ mol^{-1}

(iii) CO(g)+\frac{1}{2} O_{2}(g)\rightarrow CO_{2}(g);\\\Delta rH^{\Theta }= z\: kJ mol^{-1}

Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct ?

  • Option 1)

    y = 2z - x

  • Option 2)

    x= y - z

  • Option 3)

    z = x+y

  • Option 4)

    x = y + z

Answers (1)

best_answer

 

Electrochemistry -

It is the study of production of electricity from energy released during spontaneous chemical reactions and the use of electrical energy to bring about non spontaneous chemical transformations.

Balancing of Redox Reactions -

Oxidation number method

- wherein

1. Write the correct formula for each reactant and product.

2. Identify atom whose oxidation number is changed.

3. Calculate increase / decrease in oxidation number per atom and for the entire molecule / ion in which it occures.

4. Add H^{+}/OH^{-} on appropriate side so that the total ionic charges of reactants and products are equal.

5. Make numbers of hydrogen atoms in the expression on the two sides equal by adding H_{2}O to reactant or product

 

 

 

Oxidation number and oxidation state -

A term that is often used interchangeably with the oxidation number is the oxidation state. This implies oxidation number denote the oxidation state of an element.

-As we have learned thermodynamic

 

C_{(graphite)}+O_{2}(g)\rightarrow CO_{2}(g)\Delta _{r}H^{0}=xKJ/mol----(1)

C_{(graphite)}+\frac{1}{2}O_{2}(g)\rightarrow CO_{2}(g)\Delta _{r}H^{0}=yKJ/mol-----(2)

CO(g)+\frac{1}{2}O_{2}(g)\rightarrow CO_{2}(g)\Delta _{r}H^{0}=zKJ/mol-------(3)

(1)=(2)+(3)

X=Y+Z


Option 1)

y = 2z - x

Option 2)

x= y - z

Option 3)

z = x+y

Option 4)

x = y + z

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