Chemistry - Thermodynamics - I Question with Solution | TestHub
Match the column: (Given process does not include chemical reaction and phase change)
Column I | Column II |
|---|---|
P) Δ H = Δ U + Δ(PV) | i) Any matter undergoing any process |
Q) Δ H = n· CP,m·Δ T | ii) Isochoric process involving any substance |
R) q = Δ U | iii) Ideal gas, under any process |
| iv) Ideal gas under isothermal process |
(Column I = Relation; Column II = Applicable to)
Options:
Answer:
Solution:
Δ H = Δ U + Δ(PV) is the definition of enthalpy change, so it holds for any matter in any process — and therefore for every special case listed (P – i,ii,iii,iv). Δ H = nCP,mΔ T is exact for an ideal gas in any process, since H depends only on T; it also covers the isothermal case, where it gives zero (Q – iii,iv). For other substances it would need constant pressure. q = Δ U requires zero work, i.e. an isochoric process with only PV work, valid for any substance (R – ii).
