For which of the following systems, the difference between $Δ H$ and $Δ U$ is not significant?
(i) Solids
(ii) gases
(iii) Mixture of gases and liquids
(iv) Liquids

Question

For which of the following systems, the difference between H and U is not significant? (i) Solids (ii) gases (iii) Mixture of gases and liquids (iv) Liquids

Accepted Answer

Correct answer: A. (a) Since for solids and liquids, volume changes are insignificate. ∴ V=0 ∴ H= U+P V ⇒ H= U Therefore, the difference between H and U is almost negligible for solids and liquids.

$For which of the following systems, the difference between Δ H and Δ U is not significant? (i) Solids (ii) gases (iii) Mixture of gases and liquids (iv) Liquids$

Solution

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