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Which of the following is not correct?...

Which of the following is not correct?

A

Dissolution of `NH_(4) Cl` in excess of water is an endothermic process.

B

Neutralization is always exothermic.

C

The absolute value of enthalpy `(H)` can be determined experimentally.

D

The heat of reaction at constant volume is denoted by `Delta U`

Text Solution

Verified by Experts

The correct Answer is:
C
Defining equation of enthalpy `(H)` is
`H = U + pV`
We cannot determine experimentally the absolute value of internal energy because many energy contributions are relative and approximate. Thus, the absoulte value of enthalpy `(H)` cannot be determined experimentally.
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