CHY 102 Lecture Notes - Lecture 37: Molar Mass, Gas Laws, Ideal Gas Law

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2 Jan 2018
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Real gases approximate ideality at high t & low p. A and b are the van der waals constants. A (cid:272)orre(cid:272)ts for (cid:862)sti(cid:272)ky(cid:863) i(cid:374)tera(cid:272)tio(cid:374)s (cid:271)et(cid:449)ee(cid:374) (cid:373)ole(cid:272)ules. B corrects for the volume of the gas molecules. At small gas volumes, nb becomes appreciable (cid:4678)+(cid:1853)22(cid:4679)(cid:4666) (cid:1854)(cid:4667)=r. A cylinder is filled with 558 mol n2(g), and at 294. 3 k, p = 415 bar. The ideal gas law predicts the pressure would be 324 bar (try it yourself some time). Clearly the igl is not suitable at this gas density. For n2(g), a = 1. 408 bar l2 mol-2 and b = 0. 0391 l mol-1. Best to i(cid:374)(cid:272)lude u(cid:374)its a(cid:374)d (cid:272)a(cid:374)(cid:272)el; i did(cid:374)"t ha(cid:448)e spa(cid:272)e. Kinetic molecular theory know and understand it. Be able to interpret graphs of speed distributions. Real gases deviate from ideal behaviour because of. Know vdw equation & how to interpret non-ideal graphs. Review questions 1, 4, 6, 8-14, 17-24.

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