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JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry

\(100^{\circ} {C}\) અને \(1\, bar\)એ પાણી માટે  \(\Delta_{\text {vap }} {H}-\Delta_{\text {vap }} {U}=...... \times 10^{2} \,{~J}\, {~mol}^{-1}\).  \(\left[\right.\) ઉપયોગ કરો : \(\left.R=8.31\, {~J}\, {~mol}^{-1}\, {~K}^{-1}\right]\) [\({H}_{2} {O}({l})\)નું કદ \({H}_{2} {O}({g})\)ના કદ કરતાં ઘણું નાનું ધારો. ધારો કે \({H}_{2} {O}({g})\)ને આદર્શ વાયુ તરીકે ગણવામાં આવે છે]

  1. A \(70\)
  2. B \(89\)
  3. C \(40\)
  4. D \(31\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(31\)

Step-by-step Solution

Detailed explanation

\({H}_{2} {O}_{(\ell)} \rightleftharpoons {H}_{2} {O}_{({v})}\) \(\Delta {H}=\Delta {U}+\Delta {n}_{{g}} {RT}\) for \(1\, mole\) waters; \(\Delta {n}_{{g}}=1\) \(\therefore \Delta {n}_{{g}} {RT}=1 \,{~mol} \times 8.31\, {~J} / {mol}-{k} \times 373\, {~K}\)…
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