Which of the following is a thermochemic...

Which of the following is a thermochemical equation?

`CH_(3) OCH_(3) + 3O_(2) rarr 2 CO_(3) + 3 H_(2) O`

`CH_(3) OCH_(3) + O_(2) rarr CO_(2) + H_(2) O`

`CH_(3) OCH_(3) (l) + 3O_(2) (g) rarr 2CO_(2) (g) + 3 H_(2) O (l)`

`CH_(3) OCH_(3) (l) + 3O_(2) (g) rarr 2CO_(2) (g) + 2 H_(2) O + 1450 kJ`

Text Solution

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The correct Answer is:

A thermochemical equation is balanced chemical equation for a reaction (including phase labels) in which the equation is given a molar interpretation, and the enthalpy of reaction for these molar amount is written directly after the equation.

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Which among the following thermochemical equations represents formation of sodium chloride?

`NaOH_((aq)) + HCl_((aq)) to NaCl_((aq)) + H_2 O_((l))`

`Na_((s)) + 2HCl_((g)) to 2NaCl_((s)) + H_(2(g))`

`2Na_((s)) + Cl_(2(g)) to 2NaCl_((s))`

`Na_((s)) + 1/2 Cl_(2(g)) to NaCl_((s))`

Which of the following is a balanced chemical equation ?

`Na + H_(2) O to NaOH + H_(2)`

`H_(2) + O_(2) to H_(2) O`

`Mg + O_(2) to MgO`

`2 Mg + O_(2) to 2 MgO`

Which of the following is not a quadratic equation ?

`x^(2)+4x=11+x^(2)`

`x^(2)=4x`

`5x^(2)=90`

`2x-x^(2)-x^(2)+5`