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Consider the following reaction betwee...

Consider the following reaction between zinc and oxygen and choose the correct options out of the options given below
`2Zn(s)+ O_(2)(g) to 2 ZnO_(s): DeltaH=-693.8 kJ mol^(-1)`

A

The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ

B

The enthalpy of two moles of ZnO is more than the total enthalpy of two moles Zn and one mole of oxygen by 693.8 kJ

C

693.8 kJ `mol^(-1)` energy is evolved in the reaction

D

`693.8kJmol^(-1)` energy is absorbed in the reactions

Text Solution

Verified by Experts

The correct Answer is:
A, C
In the reaction:
`2Zn(s)+O_(2)(g)rarr2ZnO(s),`
`Delta_(r)H=sum` Enthalpy of formation of products
`sum` Enthalpy of formation of react tan ts
`=[2Delta_(f)H_(ZnO)]-[2Delta_(f)H_(Zn)+Delta_(f)H_(O_(2))]`
For exothermic reaction: `Delta_(r )H` is negative, i.e., 693.8 kJ heat is evolved.
`therefore` Enthalpy of 2 moles of ZnO will less than the enthalpy of two moles of zinc one mole of `O_(2)`
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