230_Sp10_L12_post-1(1)

230_Sp10_L12_post-1(1) - CHEM 230 Sp10 L12 Problems CH 4 6...

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CHEM 230 Sp10 L12 Problems CH 4, 6, 7 Session ID: 230
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What are the signs (assume a closed system)? q w Δ U Δ T Δ H Δ S Constant volume heating + 0 + + N/A + Isothermal compression - + 0 0 N/A - Adiabatic expansion 0 - - - N/A ? Freezing - + ?/- 0 - - Mixing 1 L gas A with 1 L of gas B in a 1L rigid container; both gases are the same T 0 0 0 0 N/A +
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B: 2 L O 2 (32 g/mol) i) Both systems have the same T, Evaluate v rms ii) Both containers have the same T and P. Evaluate n iii) Both containers have the same T and density. Evaluate P. iv) Both containers have the same T and P. Evaluate collision frequency. v) Evaluate the volume occupied by 1 mole of the gas at 1atm assuming non- ideal behavior. O 2 larger and has stronger van deer Waal’s forces so less ideal. Its attractive forces are stronger (at low P) and so it will have a smaller volume. v rms = 3 RT M Ne > O 2 O 2 > Ne larger volume P = nRT V = mRT V MW Ne > O 2 n V = P RT number of moles per volume same so collision frequency comes down to v rms v rms = 3 RT M Ne > O 2
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230_Sp10_L12_post-1(1) - CHEM 230 Sp10 L12 Problems CH 4 6...

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