\( 18: 54 \) P P P P .
?) . 11.11
MBMB 108 LECTURE 1 2024.pdf - Read-only
\( \leftarrow \)
\( \leftarrow \)
\( \kappa \pi \)
K?
\( \alpha_{0}^{\circ} \)
ANSWERS
(ii) \( \Delta \mathrm{U}=+1620 \mathrm{~J}=+1.62 \mathrm{~kJ} \)
(iii) \( q==1620 \mathrm{~J}==1.62 \mathrm{~kJ} \)
(iiii) \( w=0.00 \mathrm{~J} \)
H:XAM?L? 7
Copy \( 1.00 \mathrm{~mol} \) of an ideal gas with \( \mathrm{C}_{\mathrm{p}}=5 / 2 \mathrm{R} \) mat cnanges temperature change from \( 125 \mathrm{~K} \) to \( 255 \mathrm{~K} \) at a constant pressure of 10.0 atm. Cal ate \( \Delta \mathrm{U}, \Delta \mathrm{H}, \mathrm{q} \) and \( \mathrm{w} \) for this change.
ANSWERS
(i) \( \Delta \mathrm{U}=\Delta \mathrm{H}-\Delta(\mathrm{pV})=\Delta \mathrm{H}-\mathrm{nR} \Delta \mathrm{T}=1.62 \mathrm{~kJ} \)
(ii) \( \Delta \mathrm{H}= \) at constant pressure, \( \Delta \mathrm{H}=\mathrm{q}=2700 \mathrm{~J} \)
(iii) \( \mathrm{q}=2700 \mathrm{~J}=2.7 \mathrm{~kJ} \)
(iv) \( \mathrm{w}=\Delta \mathrm{U}-\mathrm{q}=1619.18 \mathrm{~J}-2700 \mathrm{~J}=1080.8 \mathrm{~J} \)
HXAMPL?8
Calculate \( \mathrm{q}, \mathrm{w}, \Delta \mathrm{U} \) and \( \Delta \mathrm{H} \) for \( 1.00 \mathrm{~mol} \) of an ideal gas expanding reversibly and isothermally at \( 273 \mathrm{~K} \) from a volume of \( 22.4 \mathrm{~L} \) and a pressure of \( 1.00 \mathrm{~atm} \) to a volume of \( 44.8 \mathrm{~L} \) and a pressure of \( 0.500 \mathrm{~atm} \).
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